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SPC Flooring for Kitchens in Dubai: A Comprehensive Guide

Introduction In the vibrant city of Dubai, where innovation and luxury intersect, homeowners...

https://dev.to/agha_hassaan_4b8de4b92a8a/spc-flooring-for-kitchens-in-dubai-a-comprehensive-guide-40il

spcflooringindubai, spcflooringforkitchenindubai

**Introduction** In the vibrant city of Dubai, where innovation and luxury intersect, homeowners constantly seek to enhance their living spaces with materials that offer both aesthetic appeal and practical benefits. One such material gaining immense popularity is Stone Plastic Composite (SPC) flooring. This blog delves into why [SPC flooring for Kitchen in Dubai](https://uaefloorings.com/) is an ideal choice for kitchens in Dubai, exploring its unique properties, benefits, and installation process. **What is SPC Flooring?** SPC flooring, or Stone Plastic Composite flooring, is a type of rigid vinyl flooring that is highly durable and water-resistant. It consists of several layers: **Wear Layer**: A transparent, protective layer that provides resistance against scratches and stains. Vinyl Top Coat: Adds decorative appeal with various patterns and colors. **SPC Core**: Made from a combination of limestone powder and PVC, offering exceptional stability and durability. Backing Layer: Enhances the floor's balance and sound insulation. Why Choose SPC Flooring for Kitchens in Dubai? 1. **Water Resistance** Kitchens are prone to spills, splashes, and humidity. SPC flooring is 100% waterproof, making it an excellent choice for this environment. Unlike traditional wood or laminate flooring, SPC does not swell or warp when exposed to moisture. 2. **Durability** Dubai’s climate can be harsh, with high temperatures and occasional sandstorms. SPC flooring is designed to withstand these conditions. Its rigid core provides strength and stability, while the wear layer ensures longevity, even in high-traffic areas like kitchens. 3. **Ease of Maintenance** Busy Dubai households need flooring that is easy to maintain. SPC flooring is simple to clean; regular sweeping and occasional mopping with a damp cloth keep it looking pristine. Its stain-resistant properties mean that spills can be wiped away without leaving permanent marks. 4. **Aesthetic Versatility** SPC flooring comes in a wide range of styles, colors, and patterns, mimicking the look of natural wood, stone, or tile. This versatility allows homeowners to choose a design that complements their kitchen décor, whether it’s a modern, minimalist style or a more traditional look. **Installation Process** 1. **Preparation** Before installing SPC flooring, the subfloor must be clean, dry, and level. Any existing flooring should be removed, and the surface should be free of debris and moisture. 2. **Acclimatization** SPC flooring needs to acclimate to the room’s temperature and humidity levels. It’s recommended to leave the flooring in the kitchen for 48 hours before installation to prevent expansion or contraction post-installation. 3. **Installation Methods** SPC flooring can be installed using various methods, including: **Click-Lock System**: This is the most popular method for DIY enthusiasts. The planks click together easily, creating a floating floor that doesn’t require adhesive. **Glue Down**: This method provides a more permanent solution and is ideal for areas with heavy foot traffic. **Loose Lay**: Features friction backing that holds the planks in place. It’s easy to install and remove, making it a flexible option. Benefits of SPC Flooring in Kitchens 1. **Comfort Underfoot** SPC flooring provides a comfortable surface to stand on, which is essential in kitchens where people spend a lot of time cooking and cleaning. Some SPC floors come with an attached underlayment, adding extra cushioning and sound insulation. 2. **Hypoallergenic Properties** For those with allergies, SPC flooring is a great option. It resists mold, mildew, and dust mites, contributing to a healthier indoor environment. 3. **Cost-Effective** Compared to natural stone or high-end wood, SPC flooring is more affordable while offering similar aesthetic appeal and durability. Its long lifespan and low maintenance costs make it a cost-effective choice for homeowners. **Aesthetic Appeal** 1. **Variety of Designs** SPC flooring can replicate the look of various natural materials, from classic hardwood to chic marble. This variety allows homeowners to achieve their desired kitchen style without the associated costs and maintenance of real wood or stone. 2. **Consistent Appearance** Unlike natural materials that may have variations and imperfections, SPC flooring provides a consistent look throughout the kitchen. This uniformity is particularly beneficial in open-plan layouts where a seamless transition between different areas is desired. **Environmental Considerations** 1. **Eco-Friendly Manufacturing** Many SPC flooring options are produced using environmentally friendly practices. The materials used are often recyclable, and the production process can be designed to minimize waste and emissions. 2. **Long Lifespan** The durability of SPC flooring means that it does not need to be replaced frequently, reducing the environmental impact associated with manufacturing and disposing of flooring materials. **Comparing SPC Flooring with Other Flooring Options** 1. **SPC vs. Laminate** Water Resistance: SPC flooring is more water-resistant than laminate, making it a better choice for kitchens. **Durability**: SPC is more durable and can handle heavy traffic better than laminate. **Maintenance**: Both are easy to maintain, but SPC’s resistance to scratches and stains gives it an edge. 2. **SPC vs. Tile** **Comfort**: SPC is softer and warmer underfoot compared to tile, making it more comfortable for long periods of standing. **Installation**: SPC flooring is easier and faster to install than tile, which requires more preparation and skill. **Cost**: SPC is generally more affordable than tile, both in terms of material cost and installation. 3. **SPC vs. Hardwood** **Water Resistance**: Hardwood can warp and swell when exposed to moisture, while SPC remains unaffected. **Durability**: SPC is more resistant to scratches and dents than hardwood. **Aesthetic**: While hardwood offers natural beauty, SPC can convincingly mimic the look of wood without the associated maintenance. **Tips for Maintaining SPC Flooring in Kitchens** **Regular Cleaning**: Sweep or vacuum regularly to remove dirt and debris. Mop occasionally with a damp cloth using a mild cleaner. Avoid Harsh Chemicals: Use cleaning products recommended by the flooring manufacturer to avoid damaging the wear layer. **Protective Pads**: Place felt pads under furniture legs to prevent scratches. **Doormats**: Use doormats at entryways to reduce the amount of dirt and moisture brought into the kitchen. **Conclusion** SPC flooring is an excellent choice for kitchens in Dubai, offering a blend of durability, aesthetic appeal, and practicality. Its water resistance, ease of maintenance, and cost-effectiveness make it a superior option compared to traditional flooring materials. With a wide range of designs available, homeowners can achieve their desired kitchen style without compromising on performance. Whether you are renovating an existing kitchen or designing a new one, consider SPC flooring for a long-lasting, beautiful, and functional surface.

agha_hassaan_4b8de4b92a8a

BitPower: Innovation in Decentralized Finance

BitPower is a decentralized finance (DeFi) platform that uses blockchain technology to provide users...

https://dev.to/bao_xin_145cb69d4d8d82453/bitpower-innovation-in-decentralized-finance-3ec5

BitPower is a decentralized finance (DeFi) platform that uses blockchain technology to provide users with secure, efficient and transparent financial services. The core functions of the platform include BitPower Loop and BitPower Lending. BitPower Loop automates financial transactions through smart contracts, allowing users to participate in investment and lending without relying on traditional financial institutions. It is characterized by high security, transparency and trustlessness, and all transaction records are stored on the blockchain to ensure that the data cannot be tampered with. BitPower Lending provides decentralized lending services based on blockchain. The interest rate is dynamically calculated through an algorithm, and users can directly perform lending operations without intermediaries. The platform also supports a variety of BSC assets to ensure the liquidity and stability of assets. BitPower's innovations also include the Arweave storage solution, which provides permanent and secure NFT storage and atomic asset operations. Through these features, BitPower is committed to building a trusted decentralized financial ecosystem for users. #BitPower

bao_xin_145cb69d4d8d82453

PYTHON SELENIUM ARCHITECTURE

Selenium with Python architecture has multiple components works together to automate browser...

https://dev.to/revathykarthik/python-selenium-architecture-412c

Selenium with Python architecture has multiple components works together to automate browser interactions with web browsers. Selenium is an open-source framework designed for the automation testing for web applications. It is a flexible testing tool that allows the automation tester to write testing scripts in Selenium tool and in various programming languages such as Python, Java, etc.,  Selenium WebDriver 4 Architecture Components: Test Script: It is the code we write to automate tasks in a web browser. we can write this code in different programming languages like Python, Java, or C#. WebDriver Client Library: This is a set of tools that help our test script talk to the web browser. Like a translator that helps our code give instructions to the browser. WebDriver Protocol (W3C Standard): This is the new standard way for our test script to communicate with the web browser. It ensures that no matter which browser we use, the instructions are understood in the same way. It's like a universal language that all browsers can understand. Browser Drivers: These are special programs that act as middlemen between our test script and the web browser. Each browser (like Chrome, Firefox, or Edge) has its own driver (like ChromeDriver, GeckoDriver, or EdgeDriver). These drivers translate the universal language (W3C WebDriver Protocol) into specific actions that the browser can perform. Web Browser: This is where the actual automation happens. The browser (like Chrome, Firefox, etc.) receives instructions from its driver and performs actions like clicking buttons, entering text, and navigating pages. How It Works with python: Python Test Script: we write a test script using a python and the WebDriver client library. For example, we might write a script to open a browser, go to a website, and click a button. Send Instructions: When we run your script, the WebDriver client library takes your instructions and converts them into the universal language (W3C WebDriver Protocol). Talk to the Browser Driver: The WebDriver client library sends these instructions to the appropriate browser driver (like Chrome Driver for Chrome). Driver Translates Instructions: The browser driver receives the instructions and translates them into specific actions that the browser can understand. It's like a coach giving directions to a player. Browser Executes Actions: The browser performs the actions as instructed by the driver. For example, it might open a new page, fill out a form, or click a link. Send Back Responses: After performing the actions, the browser sends back information (like the page title or the result of an action) to the driver. Driver Sends Responses Back to Script: The browser driver then sends this information back to the WebDriver client library, which in turn passes it to your test script. Test Script Continues or Finishes: Your test script processes the information, performs any necessary checks or assertions (to verify that everything worked as expected), and then continues or finishes the test. _Selenium 4:_ Reason we choose Selenium 4: Full W3C Compliance: Selenium 4 fully adopted the W3C WebDriver standard, which means it works more consistently across different browsers. Better Tools Integration: It introduced support for Chrome DevTools Protocol (CDP), allowing advanced debugging, performance analysis, and better control over browser features. Relative Locators: New feature to locate elements relative to other elements, making test scripts easier to write and understand. Full Page Screenshots: Capability to capture screenshots of the entire web page, not just the visible part. Improved Grid: Selenium Grid in Selenium 4 is easier to set up and manage, with better scalability and a more user-friendly interface. _Limitations Addressed in Selenium 4: _ Debugging and Profiling: Selenium 4's integration with Chrome DevTools provides advanced debugging and performance profiling tools. Modern Web Support: Better handling of modern web technologies and features. Simpler and Scalable Grid: Enhanced Selenium Grid with easier configuration and management.

revathykarthik

Quy Trình Thiết Kế Website Chuẩn Tại Terus Sẽ Bao Gồm Những Gì?

Thiết kế website là một quá trình phức tạp bao gồm nhiều bước quan trọng. Nó có thể được phân thành...

https://dev.to/terus_technique/quy-trinh-thiet-ke-website-chuan-tai-terus-se-bao-gom-nhung-gi-1l0n

website, digitalmarketing, seo, terus

 Thiết kế website là một quá trình phức tạp bao gồm nhiều bước quan trọng. Nó có thể được phân thành hai loại chính: thiết kế website tĩnh và thiết kế website động. Thiết kế website tĩnh là tạo ra các trang web với nội dung tĩnh, ít thay đổi. Thiết kế website động liên quan đến việc xây dựng các ứng dụng web với chức năng tương tác và nội dung thường xuyên cập nhật. Quy trình [thiết kế website tiêu chuẩn](https://terusvn.com/thiet-ke-website-tai-hcm/) thường bao gồm những bước chính sau: Tiếp nhận yêu cầu và thông tin từ khách hàng: Nhóm thiết kế cần hiểu rõ các mục tiêu, yêu cầu và thông tin về dự án từ phía khách hàng. Lập kế hoạch: Dựa trên thông tin từ khách hàng, nhóm thiết kế sẽ lập kế hoạch chi tiết cho dự án, bao gồm các mốc thời gian, nhiệm vụ và trách nhiệm của từng thành viên. Lựa chọn tên miền và hosting: Việc lựa chọn tên miền và dịch vụ hosting phù hợp là rất quan trọng để đảm bảo website hoạt động hiệu quả. Thiết kế giao diện: Nhóm thiết kế sẽ xây dựng giao diện website, bao gồm layout, màu sắc, typography, hình ảnh, v.v. nhằm tạo ra trải nghiệm người dùng tốt. Xây dựng tính năng website: Các tính năng và chức năng của website sẽ được phát triển dựa trên yêu cầu của khách hàng. Kiểm tra và chỉnh sửa: Quá trình kiểm thử và chỉnh sửa liên tục được thực hiện để đảm bảo website hoạt động ổn định và đúng theo yêu cầu. Đào tạo: Nhóm thiết kế sẽ hướng dẫn khách hàng cách vận hành và quản lý website sau khi bàn giao. Bảo trì: Việc bảo trì và cập nhật website thường xuyên là rất quan trọng để đảm bảo tính bền vững của website. Ngoài ra, quy trình thiết kế website tại Terus cũng bao gồm các bước như: Nhận yêu cầu và tư vấn, thiết kế bản website demo, hoàn thiện giao diện và triển khai tính năng, tối ưu các chỉ số chuẩn Insight, chạy thử và hoàn thiện sản phẩm, và cuối cùng là bàn giao và hướng dẫn sử dụng cho khách hàng. Quy trình thiết kế website chuẩn là một quá trình đa dạng và phức tạp, bao gồm nhiều bước quan trọng từ tiếp nhận yêu cầu, lập kế hoạch, thiết kế giao diện, phát triển tính năng, đến kiểm tra, đào tạo và bảo trì. Việc tuân thủ một quy trình thiết kế website tiêu chuẩn là rất quan trọng để [đảm bảo website đáp ứng đúng nhu cầu](https://terusvn.com/thiet-ke-website-tai-hcm/) của khách hàng và hoạt động hiệu quả trong thực tế. Tìm hiểu thêm về [Quy Trình Thiết Kế Website Chuẩn Tại Terus Sẽ Bao Gồm Những Gì?](https://terusvn.com/thiet-ke-website/quy-trinh-thiet-ke-website/) Các dịch vụ tại Terus: Digital Marketing: · [Dịch vụ Facebook Ads](https://terusvn.com/digital-marketing/dich-vu-facebook-ads-tai-terus/) · [Dịch vụ Google Ads](https://terusvn.com/digital-marketing/dich-vu-quang-cao-google-tai-terus/) · [Dịch vụ SEO Tổng Thể](https://terusvn.com/seo/dich-vu-seo-tong-the-uy-tin-hieu-qua-tai-terus/) Thiết kế website: · [Dịch vụ Thiết kế website chuẩn Insight](https://terusvn.com/thiet-ke-website/dich-vu-thiet-ke-website-chuan-insight-chuyen-nghiep-uy-tin-tai-terus/) · [Dịch vụ Thiết kế website](https://terusvn.com/thiet-ke-website-tai-hcm/)

terus_technique

The Ultimate Guide to JavaScript Objects

JavaScript objects are one of the fundamental aspects of the language, providing a way to structure...

https://www.nilebits.com/blog/2024/07/ultimate-guide-to-javascript-objects/

javascript, oop, json, webdev

[JavaScript objects](https://www.nilebits.com/blog/2024/06/javascript-objects-display-techniques/) are one of the fundamental aspects of the language, providing a way to structure and manipulate data. This guide will cover everything you need to know about JavaScript objects, from the basics to advanced concepts, with plenty of code examples to illustrate each point. What are JavaScript Objects? JavaScript objects are collections of key-value pairs, where each key (also called a property) is a string, and the value can be anything, including other objects, functions, or primitive data types. Objects are created using curly braces {} and can be used to store related data and functionality together. Basic Object Syntax ``` let person = { name: "John", age: 30, job: "Developer" }; console.log(person); ``` In the example above, person is an object with three properties: name, age, and job. Accessing Object Properties You can access object properties using dot notation or bracket notation. ``` // Dot notation console.log(person.name); // Output: John // Bracket notation console.log(person['age']); // Output: 30 ``` Modifying Object Properties You can add, update, or delete properties from an object. ``` // Adding a property person.email = "[email protected]"; console.log(person.email); // Output: [email protected] // Updating a property person.age = 31; console.log(person.age); // Output: 31 // Deleting a property delete person.job; console.log(person.job); // Output: undefined ``` Nested Objects Objects can contain other objects, allowing for complex data structures. ``` let employee = { name: "Jane", position: "Manager", contact: { email: "[email protected]", phone: "123-456-7890" } }; console.log(employee.contact.email); // Output: [email protected] ``` Methods in Objects Objects can also contain functions, which are called methods. ``` let car = { brand: "Toyota", model: "Corolla", start: function() { console.log("Car started"); } }; car.start(); // Output: Car started ``` Advanced Object Concepts Object Constructors You can use constructor functions to create multiple objects with the same properties and methods. ``` function Person(name, age) { this.name = name; this.age = age; this.greet = function() { console.log(`Hello, my name is ${this.name}`); }; } let alice = new Person("Alice", 25); let bob = new Person("Bob", 30); alice.greet(); // Output: Hello, my name is Alice bob.greet(); // Output: Hello, my name is Bob ``` Prototypes In JavaScript, each object has a prototype, which is another object that provides inherited properties and methods. ``` function Animal(name) { this.name = name; } Animal.prototype.sound = function() { console.log(`${this.name} makes a sound`); }; let dog = new Animal("Dog"); dog.sound(); // Output: Dog makes a sound ``` Object.create() The Object.create() method allows you to create a new object with a specified prototype. ``` let animal = { speak: function() { console.log(`${this.name} makes a sound`); } }; let cat = Object.create(animal); cat.name = "Cat"; cat.speak(); // Output: Cat makes a sound ``` Object Destructuring Object destructuring is a convenient way to extract multiple properties from an object into variables. ``` let user = { username: "johndoe", password: "123456", email: "[email protected]" }; let { username, email } = user; console.log(username); // Output: johndoe console.log(email); // Output: [email protected] ``` Spread Operator The spread operator (...) can be used to copy properties from one object to another. ``` let defaultSettings = { theme: "light", notifications: true }; let userSettings = { ...defaultSettings, theme: "dark" }; console.log(userSettings); // Output: { theme: "dark", notifications: true } ``` Object.freeze() and Object.seal() The Object.freeze() method prevents modifications to an object, while Object.seal() allows modifications but prevents adding or removing properties. ``` let settings = { theme: "light" }; Object.freeze(settings); settings.theme = "dark"; // No effect console.log(settings.theme); // Output: light let config = { debug: true }; Object.seal(config); config.debug = false; // Allowed config.logLevel = "verbose"; // Not allowed console.log(config); // Output: { debug: false } ``` Object.keys(), Object.values(), and Object.entries() These methods provide ways to iterate over the properties of an object. ``` let student = { name: "Alice", age: 22, grade: "A" }; // Object.keys() console.log(Object.keys(student)); // Output: ["name", "age", "grade"] // Object.values() console.log(Object.values(student)); // Output: ["Alice", 22, "A"] // Object.entries() console.log(Object.entries(student)); // Output: [["name", "Alice"], ["age", 22], ["grade", "A"]] ``` Practical Applications of JavaScript Objects Storing Configurations Objects are commonly used to store configuration settings for applications. ``` let config = { apiKey: "123456789", apiUrl: "https://api.example.com", timeout: 5000 }; console.log(config.apiKey); // Output: 123456789 ``` Managing State in Applications In front-end frameworks like React, objects are used to manage the state of components. ``` import React, { useState } from 'react'; function App() { const [state, setState] = useState({ count: 0, text: "Hello" }); return ( <div> <p>{state.text} - Count: {state.count}</p> <button onClick={() => setState({ ...state, count: state.count + 1 })}> Increment </button> </div> ); } export default App; ``` API Responses When working with [APIs](https://www.nilebits.com/blog/2024/07/apis-vs-endpoints-breaking-down-differences/), responses are often returned as objects. ``` fetch('https://api.example.com/data') .then(response => response.json()) .then(data => { console.log(data); }); ``` Object-Oriented Programming (OOP) JavaScript objects are central to OOP in JavaScript, enabling encapsulation, inheritance, and polymorphism. ``` class Vehicle { constructor(brand, model) { this.brand = brand; this.model = model; } drive() { console.log(`${this.brand} ${this.model} is driving`); } } class Car extends Vehicle { constructor(brand, model, doors) { super(brand, model); this.doors = doors; } honk() { console.log(`${this.brand} ${this.model} is honking`); } } let myCar = new Car("Toyota", "Corolla", 4); myCar.drive(); // Output: Toyota Corolla is driving myCar.honk(); // Output: Toyota Corolla is honking ``` JSON and JavaScript Objects JavaScript Object Notation (JSON) is a lightweight data interchange format based on JavaScript object syntax. Converting between JSON and JavaScript objects is straightforward. ``` let jsonString = '{"name": "Alice", "age": 25}'; let jsonObj = JSON.parse(jsonString); console.log(jsonObj); // Output: { name: "Alice", age: 25 } let newJsonString = JSON.stringify(jsonObj); console.log(newJsonString); // Output: '{"name":"Alice","age":25}' ``` References and Further Reading [MDN Web Docs: Working with Objects](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Working_with_Objects) [JavaScript.info: Objects](https://javascript.info/object) [Eloquent JavaScript: Data Structures: Objects and Arrays](https://eloquentjavascript.net/04_data.html) Conclusion JavaScript objects are versatile and powerful tools for organizing and managing data in your applications. By understanding the basics and exploring advanced concepts, you can harness the full potential of objects in JavaScript. This guide has covered the fundamental aspects of objects, including creation, manipulation, and practical applications, providing a comprehensive resource for both beginners and experienced developers.

amr-saafan

Tăng Traffic Cho Website Miễn Phí Mà Bạn Không Thể Bỏ Qua

Trong thời đại công nghệ số phát triển mạnh mẽ như hiện nay, việc thu hút và tăng lượng truy cập...

https://dev.to/terus_technique/tang-traffic-cho-website-mien-phi-ma-ban-khong-the-bo-qua-g3f

website, digitalmarketing, seo, terus

 Trong thời đại công nghệ số phát triển mạnh mẽ như hiện nay, việc thu hút và tăng lượng truy cập (traffic) vào website trở nên rất quan trọng đối với mọi doanh nghiệp, cá nhân kinh doanh trực tuyến. Có hai loại traffic chính cho website là organic traffic và paid traffic, mỗi loại đều có những ưu và nhược điểm riêng. Organic traffic là lượng truy cập đến website thông qua kết quả tìm kiếm tự nhiên trên các công cụ tìm kiếm như Google, Bing,... Đây được xem là nguồn traffic "chất lượng" vì những người truy cập thường tìm kiếm thông tin hoặc sản phẩm phù hợp với nhu cầu của họ. Tuy nhiên, để thu hút được organic traffic đòi hỏi nỗ lực lâu dài trong việc tối ưu hóa SEO (Search Engine Optimization) website. Paid traffic là lượng truy cập đến website thông qua các hình thức quảng cáo trả phí như [Google Ads](https://terusvn.com/digital-marketing/dich-vu-quang-cao-google-tai-terus/), [Facebook Ads](https://terusvn.com/digital-marketing/dich-vu-facebook-ads-tai-terus/),... Ưu điểm của paid traffic là có thể tạo ra lưu lượng truy cập nhanh chóng, nhưng lại tốn kém chi phí quảng cáo. Vì vậy, cần cân bằng giữa chi phí và hiệu quả thu được từ các chiến dịch quảng cáo trả phí. Có nhiều cách để [tăng traffic cho website](https://terusvn.com/thiet-ke-website-tai-hcm/) miễn phí như: Cải thiện SEO: Tối ưu website, nội dung, từ khóa để website có thứ hạng cao hơn trên kết quả tìm kiếm. Nghiên cứu và sử dụng từ khóa: Tìm hiểu và sử dụng các từ khóa có lưu lượng tìm kiếm cao và phù hợp với website. Đầu tư vào nội dung chất lượng: Tạo ra nội dung hữu ích, thu hút độc giả, giúp tăng thời gian truy cập và số lượt chia sẻ. Cập nhật nội dung: Thường xuyên cập nhật, bổ sung nội dung mới để giữ chân khách truy cập. Xây dựng hệ thống backlink: Tạo liên kết chất lượng từ các trang web uy tín để tăng uy tín và thứ hạng website. Link đến mạng xã hội: Chia sẻ nội dung lên các nền tảng mạng xã hội để thu hút lưu lượng truy cập. Sử dụng email marketing: Gửi email định kỳ với nội dung hữu ích để giữ chân khách hàng cũ và thu hút khách hàng mới. Phân tích dữ liệu bằng Google Analytics: Theo dõi và phân tích dữ liệu để hiểu rõ hơn về hành vi của khách truy cập. Nghiên cứu đối thủ: Quan sát chiến lược và hoạt động của đối thủ để học hỏi và áp dụng những gì phù hợp. Xây dựng cộng đồng: Tạo các diễn đàn, nhóm thảo luận liên quan đến website để thu hút lưu lượng truy cập. Ngoài ra, có thể tăng traffic bằng cách sử dụng các hình thức quảng cáo trả phí như Google Ads, Google Re-targeting, Facebook Ads, hay Influencer Marketing. Tuy nhiên, cần cân bằng giữa chi phí và hiệu quả khi sử dụng các kênh này. Việc tăng traffic cho website là rất quan trọng và cần có những chiến lược cụ thể, bao gồm cả những phương pháp miễn phí lẫn trả phí, để đạt được hiệu quả tối ưu. Việc lựa chọn và kết hợp những phương pháp phù hợp sẽ giúp tăng lưu lượng truy cập, nâng cao danh tiếng thương hiệu, và cuối cùng là gia tăng doanh thu cho doanh nghiệp. Tìm hiểu thêm về [Tăng Traffic Cho Website Miễn Phí Mà Bạn Không Thể Bỏ Qua](https://terusvn.com/thiet-ke-website/cach-tang-traffic-cho-website/) Các dịch vụ tại Terus: Digital Marketing: · [Dịch vụ Facebook Ads](https://terusvn.com/digital-marketing/dich-vu-facebook-ads-tai-terus/) · [Dịch vụ Google Ads](https://terusvn.com/digital-marketing/dich-vu-quang-cao-google-tai-terus/) · [Dịch vụ SEO Tổng Thể](https://terusvn.com/seo/dich-vu-seo-tong-the-uy-tin-hieu-qua-tai-terus/) Thiết kế website: · [Dịch vụ Thiết kế website chuẩn Insight](https://terusvn.com/thiet-ke-website/dich-vu-thiet-ke-website-chuan-insight-chuyen-nghiep-uy-tin-tai-terus/) · [Dịch vụ Thiết kế website](https://terusvn.com/thiet-ke-website-tai-hcm/)

terus_technique

Domination Plumbing and Heating

"Domination Plumbing and Heating is the most trusted plumber and HVAC contractor in Worcester, MA. We...

https://dev.to/domination_plumbing_7f518/domination-plumbing-and-heating-npg

"Domination Plumbing and Heating is the most trusted plumber and HVAC contractor in Worcester, MA. We provides residential and commercial plumbing, heating, and gas line installations, repairs, and sewer and drain cleaning in Worcester, MA and surrounding areas. Our journey began in 2019 in Worcester, MA. We saw that people were searching for dependable plumbing and heating services that wouldn't let them down. That's when we stepped up and founded Domination Plumbing and Heating. From day one, our mission has been clear - do the job right the first time. Now, folks in Leominster trust us as their go-to for plumbing and heating needs. So next time your pipes act up or your heater's on the fritz, remember - we've got your back!" [**_plumber Worcester MA_**](https://dominationplumbing.com/).

domination_plumbing_7f518

Portfolio or no portfolio? 🗂️

2nd question from the Dev Pools series. Same rules as before. Since we can't add polls, we select...

https://dev.to/devonremote/portfolio-or-no-portfolio-5d5g

discuss, career, programming

**2nd question** from the **Dev Pools** series. Same rules as before. Since we can't add polls, we select an emoji. **Do you own portfolio site or not?** ❤️ - Yes, of course 🤯 - Nahh, don't need it --- Btw, why do you think its important, or why you think its not needed?

devonremote

Protected route by token

Get token from authSlice.tsx import { RootState } from './store'; import { createSlice } from...

https://dev.to/debos_das_9a77be9788e2d6e/protected-route-by-token-2ecl

``` Get token from authSlice.tsx import { RootState } from './store'; import { createSlice } from '@reduxjs/toolkit'; type TAuthSate = { user: null | object; token: null | string; }; const initialState: TAuthSate = { user: null, token: null, }; const authSlice = createSlice({ name: 'auth', initialState, reducers: { setUser: (state, action) => { const { user, token } = action.payload; state.user = user; state.token = token; }, logout: (state) => { state.user = null; state.token = null; }, }, }); export const { setUser, logout } = authSlice.actions; export default authSlice.reducer; export const userCurrentToken = (state: RootState) => state.auth.token; export const userCurrentUser = (state: RootState) => state.auth.user; ``` **And this is ProtectedRoute.tsx** ``` `import { ReactNode } from 'react'; import { useAppSelector } from '../../redux/features/hook'; import { userCurrentToken } from '../../redux/features/authSlice'; import { Navigate } from 'react-router-dom'; const ProtectedRote = ({ children }: { children: ReactNode }) => { const token = useAppSelector(userCurrentToken); if (!token) { return <Navigate to="/login" replace={true} />; } return children; }; ``` export default ProtectedRote; ` **This is router.tsx** ` ``` { path: '/admin', element: ( <ProtectedRote> <App /> </ProtectedRote> ), children: routeGenarator(adminPaths), }, ``` `

debos_das_9a77be9788e2d6e

BitPower's revenue introduction:

BitPower Loop is a decentralized financial platform that provides an efficient and secure income...

https://dev.to/xin_wang_e8a515f2373224df/bitpowers-revenue-introduction-7g6

BitPower Loop is a decentralized financial platform that provides an efficient and secure income mechanism through smart contracts. The platform allows users to participate directly as depositors or borrowers, and obtain floating interest rate income through decentralized liquidity provision and smart contract operations. The annualized rate of return of BitPower Loop is significantly higher than that of traditional financial products, attracting a large number of investors. BitPower Loop's income mainly comes from two parts: recurring income and commission sharing. Recurring income is the return obtained by users by providing liquidity, while commission sharing is obtained by recommending new users to participate in the platform. This model not only increases the liquidity of the platform, but also encourages users to actively participate. In particular, when users recommend friends, the referrer can obtain corresponding commission rewards based on the recurring income of their referrals, up to 17 levels of rewards. Through secure and reliable smart contracts, BitPower Loop ensures the transparency and immutability of all transactions, providing users with a trustworthy income platform. At the same time, the characteristics of global services make it competitive internationally. In short, BitPower Loop has become a leader in the field of decentralized finance with its high returns, transparency and security. @BitPower

xin_wang_e8a515f2373224df

Chi Phí Để Đầu Tư Cho Thiết Kế Website Là Bao Nhiêu?

Thiết kế và duy trì website là một quá trình đòi hỏi nhiều chi phí khác nhau. Để hiểu rõ hơn về các...

https://dev.to/terus_technique/chi-phi-de-dau-tu-cho-thiet-ke-website-la-bao-nhieu-113f

website, digitalmarketing, seo, terus

 [Thiết kế và duy trì website](https://terusvn.com/thiet-ke-website-tai-hcm/) là một quá trình đòi hỏi nhiều chi phí khác nhau. Để hiểu rõ hơn về các khoản chi phí này, hãy cùng Terus đi tìm hiểu chi tiết ở bài viết dưới đây. Các loại chi phí khi thiết kế website: Chi phí duy trì tên miền: Các dịch vụ tên miền Việt Nam thường có thêm các chi phí quản lý và hỗ trợ từ cơ quan quản lý. Ngoài ra, tên miền Việt Nam cũng có thể có phí gia hạn cao hơn so với tên miền quốc tế. Phí hosting hàng năm: Là chi phí để thuê dịch vụ lưu trữ website trên máy chủ. Mức phí này phụ thuộc vào dung lượng lưu trữ, băng thông, tài nguyên máy chủ, và các tính năng bổ sung. Chi phí nâng cấp, sửa chữa lỗi: Chi phí này bao gồm các khoản chi phí để cập nhật phiên bản mới, sửa chữa lỗi, và phát triển các tính năng mới cho website. Chi phí duy trì SSL hàng năm: SSL (Secure Sockets Layer) là công nghệ bảo mật giúp website trở nên an toàn hơn. Chi phí duy trì SSL hàng năm là khoản phí được trả cho nhà cung cấp dịch vụ SSL. Chi phí bảo trì Website hàng năm: Chi phí bảo trì website hàng năm bao gồm các khoản chi phí cho việc kiểm tra, bảo dưỡng và cập nhật thường xuyên để website hoạt động ổn định. Chi phí thiết kế Website: Chi phí thiết kế website là khoản chi phí một lần để xây dựng và triển khai website mới. Các yếu tố ảnh hưởng đến chi phí thiết kế bao gồm: quy mô website, tính năng, thiết kế,... Mức giá trung bình để thiết kế Website: Mức giá trung bình để thiết kế một website hoàn chỉnh dao động từ 5.000.000 VND đến 50.000.000 VND tùy thuộc vào quy mô và tính năng của website. Việc lựa chọn [dịch vụ thiết kế website](https://terusvn.com/thiet-ke-website-tai-hcm/) giá rẻ có thể mang lại rủi ro về chất lượng. Tuy nhiên, nếu được cân nhắc kỹ lưỡng, một số dịch vụ giá rẻ vẫn có thể đáp ứng được nhu cầu cơ bản của doanh nghiệp. Trong quá trình thiết kế và duy trì website, các chi phí liên quan như hosting, tên miền, bảo mật, bảo trì,... cần được tính toán và lên kế hoạch cẩn thận. Việc cân bằng giữa chi phí và chất lượng là điều cần thiết để đảm bảo website hoạt động hiệu quả và đáp ứng nhu cầu của doanh nghiệp. Tìm hiểu thêm về [Chi Phí Để Đầu Tư Cho Thiết Kế Website Là Bao Nhiêu?](https://terusvn.com/thiet-ke-website/thiet-ke-website-bao-nhieu-chi-phi/) Các dịch vụ tại Terus: Digital Marketing: · [Dịch vụ Facebook Ads](https://terusvn.com/digital-marketing/dich-vu-facebook-ads-tai-terus/) · [Dịch vụ Google Ads](https://terusvn.com/digital-marketing/dich-vu-quang-cao-google-tai-terus/) · [Dịch vụ SEO Tổng Thể](https://terusvn.com/seo/dich-vu-seo-tong-the-uy-tin-hieu-qua-tai-terus/) Thiết kế website: · [Dịch vụ Thiết kế website chuẩn Insight](https://terusvn.com/thiet-ke-website/dich-vu-thiet-ke-website-chuan-insight-chuyen-nghiep-uy-tin-tai-terus/) · [Dịch vụ Thiết kế website](https://terusvn.com/thiet-ke-website-tai-hcm/)

terus_technique

Why You Shouldn't Stick with Just JavaScript

JavaScript is a fantastic language to start with, offering the flexibility to build almost anything...

https://dev.to/themuneebh/why-you-shouldnt-stick-with-just-javascript-5h23

javascript, webdev, softwareengineering

JavaScript is a fantastic language to start with, offering the flexibility to build almost anything without needing to learn other syntaxes. But in the real world, the ease of use of a language's syntax is less important than where and how effectively it is used. While JavaScript is the undisputed king of the frontend, it has its limitations. Exploring other languages can broaden your horizons and open new opportunities. Here’s why you should consider stepping out of your comfort zone: ### Language Highlights: - **Java**: A favorite for fintech and enterprise applications, and essential for native Android development. - **C#**: Trusted by big companies for enterprise software, game development with Unity, and robust .NET applications. - **Python**: Excels in rapid web development with Django and FastAPI, and is the leading language for machine learning and AI. - **PHP**: Powers 75% of the web; Laravel and WordPress offer incredible capabilities. - **Golang**: Ideal for building performant and scalable systems, microservices, with fast compilation and excellent tooling. - **Rust**: Known for mission-critical systems, outstanding performance, and error-free development. - **Swift**: The go-to for native iOS development. By sticking with just one language, you might be limiting your potential. Specialization should not be tied to a single language or syntax, but rather to the broader field. In today's competitive job market, especially with the risk of layoffs, learning multiple languages and engaging with their communities can open more doors and expand your perspective. Who knows, you might even start the next big thing. Thanks for reading.

themuneebh

tininest baby products

In the US market, tiny baby products prioritize safety, comfort, and adorable designs. From miniature...

https://dev.to/seotininest_d16c39f4d6a28/tiny-baby-product-4gpe

tiny, baby, product

In the US market,[ tiny baby products ](https://tininest.com/)prioritize safety, comfort, and adorable designs. From miniature clothing made of soft, hypoallergenic fabrics to gentle skincare products, each item caters to the delicate needs of newborns. customers.

seotininest_d16c39f4d6a28

5 Things to Keep in Mind while designing a Website

Every designer think to make a perfect website for his client. Here are the most Important things...

https://dev.to/lakshita_kumawat/5-things-to-keep-in-mind-while-designing-a-website-2gl9

Every designer think to make a perfect website for his client. Here are the most Important things that I think you should always keep in Mind while designing: ### 1. The Goal of the Website  While you design a website make sure you think the following questions: - What are the main target audience of your website? - Why they will visit your website? - What they want? - Why will they choose you? - Or What is special about your website? These question are very helpful to find the main goal of the website But make sure to write less lines which are easy to understand. No one will read your content if it is too big! ### 2. Hero Section **Hero Section** are the first _impression_ of the website. If your hero section does not look good then the client will Not even scroll your website!  Your should make your hero section Unique and Creative. You should focus on the goal of the website and add images related to your content. You can also write a quote that matches your goal to make it attractive. Try to make your content short and easy to understand. Only write the important things about your website and don't write things that does not relate to your goal! ### 3. Images Images give a nice impression about your website. If you visit any website, you will see that there are many images related to the content. People don't like to read much. Images are best way to express your content. You should always select the right image for your content. A bad image can also destroy the look of your website. Look at the image below. It is a good example of using a good image.  If you use a image in the background of the Hero Section make sure not to use high contrast images, they looks bad. Also make sure there is enough spacing in the image to write your content. Never write your content over the image make sure to write at a empty place. If you use the image in the Hero section also make sure that the color of your image match your website. You can also use your Hero section image to select your color palette. If your website color does not match with your image it looks strange. ### 4. Proper Spacing And Alignment If you see any website, you will see that all the elements are properly align and have proper spacing. Spacing is an important thing which make your website easy to read. You should not use all the space for writing the content. Its will make a huge mass!! Instead try to give nice spacing between all the elements. It will make your website look more better then a mass. Alignment is also important. You should properly align your elements. Most of the junior designer get confused which alignment will looks good for their website? Most of the Designer prefer left alignment as it look good on all websites. ### 5. Correct Fonts The last thing to keep in mind is to use the correct font. If the font is not correct, it will also make your website look bad. It is important to chose a correct font. You can see different kinds of fonts from Google Fonts and you can also use it in your code. You can also read article on how to chose correct fonts on other website. So Here are the 5 main things to keep in mind while reading a website. Thanks for reading for that long. Hope you like the post. I try to make it simple and easy to understand.

lakshita_kumawat

COMPANY TO RECOVER CRYPTO AFTER SCAM -Victims \\ FOLKWIN EXPERT RECOVERY.

( Contact with a representative through: Email: Folkwinexpertrecovery(AT)tech-center . com ( ...

https://dev.to/theodore_henry_841574769e/company-to-recover-crypto-after-scam-victims-folkwin-expert-recovery-i6c

( Contact with a representative through: Email: Folkwinexpertrecovery(AT)tech-center . com ( WhatsApp +1 (740)705-0711 Website www.folkwinexpertrecovery . co m .. For traders who have fallen victim to scams in cryptocurrency, binary options, or forex trading, I empathize with your experience. It's crucial to exercise caution and due diligence before investing with any broker. I, too, was once scammed out of GBP 61,500 by an online broker, an experience that left me devastated and disillusioned. However, I found a glimmer of hope in the form of someone who helped me recover all my lost funds. It was a long and arduous journey, but with perseverance and the right support, justice was served. If you find yourself in a similar situation—whether you've been scammed by an unregulated broker, manipulated into making additional deposits, or had your account unfairly blocked—know that you're not alone. There are avenues for recourse, and assistance is available to help you reclaim what's rightfully yours. One such ally in the fight against financial fraud is Dr. Dominic from FOLKWIN EXPERT RECOVERY and his dedicated team. They specialize in recovering lost funds from fraudulent brokers, employing advanced techniques and expertise to navigate the complexities of the digital landscape. When I reached out to Dr. Dominic who works in FOLKWIN EXPERT RECOVERY, I was met with professionalism, empathy, and a commitment to justice. His team meticulously investigated my case, leaving no stone unturned in their pursuit of justice. Their approach was methodical and thorough, reminiscent of a digital detective unraveling a complex mystery. With each breakthrough, I felt a renewed sense of hope and determination. Finally, the day arrived when I received the news that I had been longing for my lost funds to have been successfully recovered. It was a moment of triumph, a testament to the power of resilience and the importance of seeking help when faced with adversity. If you're grappling with the aftermath of a scam, don't hesitate to reach out to Dr. Dominic and his team at FOLKWIN EXPERT RECOVERY. They understand the intricacies of financial fraud and have the tools and expertise to help you reclaim what's rightfully yours. Remember, you deserve justice, and you don't have to navigate this journey alone. With the right support and guidance, you can emerge from this ordeal stronger and more empowered than ever before. While falling victim to a scam is a painful and disheartening experience, there is hope for recovery. By seeking assistance from professionals like Dr. Dominic and his team at FOLKWIN EXPERT RECOVERY, you can take proactive steps toward reclaiming your lost funds and restoring your asset protection. Best Regards, Mr Theodore Henry. 

theodore_henry_841574769e

Mastering Branching Statements and Beyond: A Collection of Go Programming Tutorials

The article is about a collection of seven Go programming tutorials from LabEx, covering a wide range of topics to help you master the language. From learning about switch-case branch statements and working with directories, to implementing timeouts with channels and manipulating arrays, this comprehensive guide will elevate your coding skills to new heights. The tutorials are designed to simplify complex concepts, making them accessible to both beginners and experienced developers. Whether you're looking to streamline your conditional logic, navigate the file system, or explore data structures, this article provides a valuable resource to enhance your Go programming journey.

https://dev.to/labex/mastering-branching-statements-and-beyond-a-collection-of-go-programming-tutorials-324c

go, coding, programming, tutorial

Exploring the intricacies of programming can be a thrilling journey, and LabEx is here to guide you through a series of captivating Go language tutorials. From mastering switch-case statements to delving into the world of directories, timeouts, and time formatting, this collection promises to elevate your coding skills to new heights. 🚀  ## 1. Switch-Case Branch Statements: Simplifying Complex Conditions [Switch-Case Branch Statements](https://labex.io/labs/149072) In the previous experiment, we learned about the usage of `if` branch statements. In this lab, we will explore the power of `switch-case` branch statements. Compared to `if` statements, `switch` statements are more suitable for handling multiple condition scenarios, making your code more concise and readable.  ## 2. Concise Switch Statement Explanation: A Powerful Conditional Tool [Concise Switch Statement Explanation](https://labex.io/labs/15516) The `switch` statement is a conditional statement that allows you to execute different code blocks based on the value of an expression. It is a powerful tool that can simplify your code and make it more readable. 🤓  ## 3. Working with Directories in Go: Navigating the File System [Working with Directories in Go](https://labex.io/labs/15468) In this lab, you will learn how to work with directories in Go. Go provides several useful functions for working with directories in the file system, empowering you to manage your project's file structure with ease.  ## 4. Implementing Go Timeouts with Channels: Ensuring Reliable Execution [Implementing Go Timeouts with Channels](https://labex.io/labs/15523) The purpose of this lab is to implement timeouts in Go using channels and `select`. Mastering this technique will help you build more robust and responsive applications, ensuring that your code can handle unexpected delays or long-running tasks gracefully.  ## 5. Time Formatting and Parsing: Mastering Date and Time in Golang [Time Formatting and Parsing](https://labex.io/labs/15521) This lab focuses on time formatting and parsing in Golang. Golang provides pattern-based layouts for time formatting and parsing, allowing you to easily work with date and time data in your applications.  ## 6. Introduction to Go Variables: The Building Blocks of Programming [Introduction to Go Variables](https://labex.io/labs/149065) Why do we need variables in computer programming languages? This is an age-old question. Just as we can remember that the URL for the LabEx is labex.io, computer programs also need to remember some data for their use. In this lab, you'll dive into the world of Go variables and learn how to effectively utilize them in your code.  ## 7. Arrays Manipulation in Golang: Unlocking Data Structures [Arrays Manipulation in Golang](https://labex.io/labs/15453) This lab will test your understanding of arrays in Golang. You will be required to create and manipulate arrays of different types, expanding your knowledge of data structures and their practical applications.  Embark on this exciting journey of Go programming tutorials and unlock the full potential of your coding skills. 🎉 Happy learning! --- ## Want to learn more? - 🌳 Learn the latest [Go Skill Trees](https://labex.io/skilltrees/go) - 📖 Read More [Go Tutorials](https://labex.io/tutorials/category/go) - 🚀 Practice thousands of programming labs on [LabEx](https://labex.io) Join our [Discord](https://discord.gg/J6k3u69nU6) or tweet us [@WeAreLabEx](https://twitter.com/WeAreLabEx) ! 😄

labby

Engineering Challenges in Developing a FinTech Platform

I have spent over 13 years working in FinTech engineering and product development across multiple...

https://dev.to/azomshahriar/engineering-challenges-in-developing-a-fintech-platform-4i09

I have spent over 13 years working in FinTech engineering and product development across multiple organizations. From my experience, let me share a few common challenges in developing and engineering FinTech platforms, such as Digital Wallets, Accounting, Transactions, and Payments. Here we won't discuss common system challenges like performance, scalability, availability, reliability, and risk & security.  **1. Accounting** Maintaining double-entry bookkeeping is crucial. When we add money to an account, another contra account must be deducted. In accounting terms, when we credit one account, we need to debit another account simultaneously. This allows us to trace platform money movement and manage internal reconciliation effectively. Categorize all accounts into two major classes: Assets and Liabilities. Remember: When an Asset is Debited, it increases. When a Liability is Credited, it increases. **2. Atomicity & Transaction** Any operation or group of operations should be atomic in nature. ACID-compliant databases are more suitable for this requirement. For example, if you want to perform a payment, multiple operations are involved: 1. Deducting the amount from the payer's account & Crediting the amount to the payee's account 2. Deduct payment fee from payer and increase income account 3. corresponding VAT transaction 4. Logging the three transaction details. 4. Some other state update All five operations must be atomic, meaning either all five operations succeed or all fail. There should be no scenario where operations 1, 2, and 4 succeed and operations 3 & 5 fail. We can achieve atomicity by using RDMS transactions feature. **3. Consistency** All write operations should be consistent. For instance, when we update a balance, it should be immediately reflected across all master nodes. Any subsequent read operation should retrieve the updated balance. **4. Double Spending issue** In digital money systems, double spending means a sender can attempt to send or pay the same funds to multiple recipients simultaneously. For example: User A has a $100 balance. At the same time, User A tries to: Send $100 to User B Send $100 to User C To prevent this issue, we need to implement a proper locking mechanism. This will ensure that once a transaction starts, the balance is locked, preventing any simultaneous transactions and avoiding double-spending. **5. Concurrency in Balance update** After each transaction or accounting event, we need to update the account balance. If two concurrent requests try to update the balance, there is a possibility of an incorrect or "dirty" balance. For example: User A has a $100 balance. User A receives $100 from two accounts simultaneously. The first request reads the balance as $100 and updates it to $100 + $100 = $200. At the same time, the second request also reads the balance as $100 and updates it to $200. This results in an incorrect balance update. We need to handle this concurrency issue to ensure accurate balance updates. **6. DeadLock handling** Using a database lock can lead to deadlock, so we need to handle it properly. **7. Duplicate Request handling and Idempotency** The same transaction request or operation can reach the server multiple times due to: - Double-clicking from the browser - Re-transmitted network packets - Client retry mechanisms A FinTech platform should be able to handle this issue by implementing a unique request ID and idempotent key for each request. **8. Internal Reconciliation ** All money movements on a FinTech platform should be reconcilable almost in real-time. This ensures that any unauthorized alterations by intruders or internal resources are detected. If someone alters data or balances at the data layer, the discrepancy will be immediately reflected in the internal reconciliation report. **9. External Reconciliation** When a FinTech platform communicates with other systems, it must be reconciled with the third-party state. Every event should be traceable using both internal and external reference IDs. **10. Audition & Tracing** All state change events must be auditable. If any event occurs, such as a transaction, balance update, account state update, or any other data change, the following information must be captured: - Creator - Modifier - Inputter/Authorizer (Maker/Checker) - Creation time - Modified time - Complete change history This ensures thorough tracking and accountability for all actions. **11. Append only nature and data immutability ** All events and change history should be append-only in nature. Events such as transactions and balance changes should be immutable. This ensures that once an event is recorded, it cannot be altered or deleted. **12. Celebrity account/wallet problem ** This issue can arise when an account receives money from millions of senders (e.g., a biller receiving payments nationwide on the last payment date). Regular merchant account lock won't work here. The FinTech core needs to handle these balance and transaction events differently. Similarly, a merchant wallet might need to send/payout/disburse money to millions of receivers at once. **13. Decimal Problem and rounding ** Decimal and rounding issues can occur in amount and balance calculations. These need to be handled properly. In Java, it is recommended to use BigDecimal instead of Double for precise arithmetic operations. **14. Insight reports** It's essential to implement insight reports for maintaining the integrity of a FinTech core accounting platform. Examples include balance sheets, trial balances, cash flow statements, payable and receivable reports, and profit and loss statements. These reports provide critical insights into financial health and performance. **15. More important features ** Several common feature-level challenges need to be handled properly in FinTech platforms, such as: - Day-end process and close of business procedures - Adjustment and compensation transactions, reversals, and refunds - Sundry and escrow management - Account state management (PENDING, ACTIVE, FREEZE, HOLD, BLOCKED, CLOSED, DEBIT_BLOCKED, CREDIT_BLOCKED) - Management of holding balances and pending transactions - Implementation of the Inputter/Authorizer (Maker/Checker) concept to ensure that large transaction events involve at least two persons for execution We believe every tech company, whether a startup or enterprise, needs a digital wallet/account/ledger platform to: Receive, store, and move money Manage internal accounting and finance Support both open and closed-loop wallet/account economies Model complex transactions, such as payments, fund collections, repayments, and loan disbursements. **At LooFi, we have addressed all these challenges. **The LooFi Digital Wallet/Account/Transaction Engine can be used in: - FinTech - MFI/MFS - E-Wallet/Digital Wallet/Payment Platform/Virtual Card - BNPL/Lending Platform - WealthTech/Investment/Crowdfunding Platform - Digital/Neo Banking - ERP - Any tech enterprise or startup that wants to receive, store, and move money If you need a digital wallet/account platform, contact us. Our solution can be used independently or integrated with your existing platform. We offer cost-effective assistance in various models: - B2B API SaaS model - On-Prem Deployment - Co-Development & Consultation Email: [email protected], [email protected] WhatsApp: +8801674242986 These are not the only challenges when building a robust FinTech platform. There are many more. If you are facing any specific challenges, please comment and share your experience.

azomshahriar

Engineering Challenges in Developing a FinTech Platform

I have spent over 13 years working in FinTech engineering and product development across multiple...

https://dev.to/azomshahriar/engineering-challenges-in-developing-a-fintech-platform-1d1k

I have spent over 13 years working in FinTech engineering and product development across multiple organizations. From my experience, let me share a few common challenges in developing and engineering FinTech platforms, such as Digital Wallets, Accounting, Transactions, and Payments. Here we won't discuss common system challenges like performance, scalability, availability, reliability, and risk & security.  **1. Accounting** Maintaining double-entry bookkeeping is crucial. When we add money to an account, another contra account must be deducted. In accounting terms, when we credit one account, we need to debit another account simultaneously. This allows us to trace platform money movement and manage internal reconciliation effectively. Categorize all accounts into two major classes: Assets and Liabilities. Remember: When an Asset is Debited, it increases. When a Liability is Credited, it increases. **2. Atomicity & Transaction** Any operation or group of operations should be atomic in nature. ACID-compliant databases are more suitable for this requirement. For example, if you want to perform a payment, multiple operations are involved: 1. Deducting the amount from the payer's account & Crediting the amount to the payee's account 2. Deduct payment fee from payer and increase income account 3. corresponding VAT transaction 4. Logging the three transaction details. 4. Some other state update All five operations must be atomic, meaning either all five operations succeed or all fail. There should be no scenario where operations 1, 2, and 4 succeed and operations 3 & 5 fail. We can achieve atomicity by using RDMS transactions feature. **3. Consistency** All write operations should be consistent. For instance, when we update a balance, it should be immediately reflected across all master nodes. Any subsequent read operation should retrieve the updated balance. **4. Double Spending issue** In digital money systems, double spending means a sender can attempt to send or pay the same funds to multiple recipients simultaneously. For example: User A has a $100 balance. At the same time, User A tries to: Send $100 to User B Send $100 to User C To prevent this issue, we need to implement a proper locking mechanism. This will ensure that once a transaction starts, the balance is locked, preventing any simultaneous transactions and avoiding double-spending. **5. Concurrency in Balance update** After each transaction or accounting event, we need to update the account balance. If two concurrent requests try to update the balance, there is a possibility of an incorrect or "dirty" balance. For example: User A has a $100 balance. User A receives $100 from two accounts simultaneously. The first request reads the balance as $100 and updates it to $100 + $100 = $200. At the same time, the second request also reads the balance as $100 and updates it to $200. This results in an incorrect balance update. We need to handle this concurrency issue to ensure accurate balance updates. **6. DeadLock handling** Using a database lock can lead to deadlock, so we need to handle it properly. **7. Duplicate Request handling and Idempotency** The same transaction request or operation can reach the server multiple times due to: - Double-clicking from the browser - Re-transmitted network packets - Client retry mechanisms A FinTech platform should be able to handle this issue by implementing a unique request ID and idempotent key for each request. **8. Internal Reconciliation ** All money movements on a FinTech platform should be reconcilable almost in real-time. This ensures that any unauthorized alterations by intruders or internal resources are detected. If someone alters data or balances at the data layer, the discrepancy will be immediately reflected in the internal reconciliation report. **9. External Reconciliation** When a FinTech platform communicates with other systems, it must be reconciled with the third-party state. Every event should be traceable using both internal and external reference IDs. **10. Audition & Tracing** All state change events must be auditable. If any event occurs, such as a transaction, balance update, account state update, or any other data change, the following information must be captured: - Creator - Modifier - Inputter/Authorizer (Maker/Checker) - Creation time - Modified time - Complete change history This ensures thorough tracking and accountability for all actions. **11. Append only nature and data immutability ** All events and change history should be append-only in nature. Events such as transactions and balance changes should be immutable. This ensures that once an event is recorded, it cannot be altered or deleted. **12. Celebrity account/wallet problem ** This issue can arise when an account receives money from millions of senders (e.g., a biller receiving payments nationwide on the last payment date). Regular merchant account lock won't work here. The FinTech core needs to handle these balance and transaction events differently. Similarly, a merchant wallet might need to send/payout/disburse money to millions of receivers at once. **13. Decimal Problem and rounding ** Decimal and rounding issues can occur in amount and balance calculations. These need to be handled properly. In Java, it is recommended to use BigDecimal instead of Double for precise arithmetic operations. **14. Insight reports** It's essential to implement insight reports for maintaining the integrity of a FinTech core accounting platform. Examples include balance sheets, trial balances, cash flow statements, payable and receivable reports, and profit and loss statements. These reports provide critical insights into financial health and performance. **15. More important features ** Several common feature-level challenges need to be handled properly in FinTech platforms, such as: - Day-end process and close of business procedures - Adjustment and compensation transactions, reversals, and refunds - Sundry and escrow management - Account state management (PENDING, ACTIVE, FREEZE, HOLD, BLOCKED, CLOSED, DEBIT_BLOCKED, CREDIT_BLOCKED) - Management of holding balances and pending transactions - Implementation of the Inputter/Authorizer (Maker/Checker) concept to ensure that large transaction events involve at least two persons for execution We believe every tech company, whether a startup or enterprise, needs a digital wallet/account/ledger platform to: Receive, store, and move money Manage internal accounting and finance Support both open and closed-loop wallet/account economies Model complex transactions, such as payments, fund collections, repayments, and loan disbursements. **At LooFi, we have addressed all these challenges. **The LooFi Digital Wallet/Account/Transaction Engine can be used in: - FinTech - MFI/MFS - E-Wallet/Digital Wallet/Payment Platform/Virtual Card - BNPL/Lending Platform - WealthTech/Investment/Crowdfunding Platform - Digital/Neo Banking - ERP - Any tech enterprise or startup that wants to receive, store, and move money If you need a digital wallet/account platform, contact us. Our solution can be used independently or integrated with your existing platform. We offer cost-effective assistance in various models: - B2B API SaaS model - On-Prem Deployment - Co-Development & Consultation Email: [email protected], [email protected] WhatsApp: +8801674242986 These are not the only challenges when building a robust FinTech platform. There are many more. If you are facing any specific challenges, please comment and share your experience.

azomshahriar

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https://dev.to/minelabzmc/we-make-it-simple-to-start-monetizing-your-server-on-minecraft-by-providing-our-very-own-self-hosted-solution-3380

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minelabzmc

Thiết Kế Website Bán Sách Tối Ưu Doanh Thu

Đối với các doanh nghiệp kinh doanh sách, việc xây dựng một website bán hàng trực tuyến có thể mang...

https://dev.to/terus_technique/thiet-ke-website-ban-sach-toi-uu-doanh-thu-12ek

website, digitalmarketing, seo, terus

 Đối với các doanh nghiệp kinh doanh sách, việc xây dựng một website bán hàng trực tuyến có thể mang lại rất nhiều lợi ích. Một website bán sách trực tuyến không chỉ giúp tiếp cận được nhóm khách hàng mục tiêu rộng hơn, mà còn có thể mang lại nhiều lợi ích khác như tiết kiệm chi phí, xây dựng và quảng bá thương hiệu, tăng hiệu quả kinh doanh, nâng cấp sản phẩm, cũng như tăng lợi nhuận. Để [thiết kế một website bán sách trực tuyến hiệu quả](https://terusvn.com/thiet-ke-website-tai-hcm/), cần chú ý đến một số tiêu chí quan trọng như bố cục chặt chẽ và dễ sử dụng, sử dụng ngôn ngữ dễ hiểu, dễ dàng khám phá các đường liên kết, thời gian tải về nhanh, dễ theo dõi quá trình bán hàng, và tương thích với các trình duyệt web và thiết bị di động. Với kinh nghiệm và chuyên môn trong lĩnh vực thiết kế website bán sách, Terus cam kết mang đến các [giải pháp website bán sách trực tuyến hiệu quả](https://terusvn.com/thiet-ke-website-tai-hcm/), giúp các doanh nghiệp kinh doanh sách tăng khả năng tiếp cận khách hàng, nâng cao thương hiệu, và tối đa hóa lợi nhuận. Hãy liên hệ với Terus ngay hôm nay để được tư vấn và thiết kế website bán sách phù hợp với nhu cầu của doanh nghiệp. Tìm hiểu thêm về [Thiết Kế Website Bán Sách Tối Ưu Doanh Thu](https://terusvn.com/thiet-ke-website/terus-thiet-ke-website-ban-sach/) Các dịch vụ tại Terus: Digital Marketing: · [Dịch vụ Facebook Ads](https://terusvn.com/digital-marketing/dich-vu-facebook-ads-tai-terus/) · [Dịch vụ Google Ads](https://terusvn.com/digital-marketing/dich-vu-quang-cao-google-tai-terus/) · [Dịch vụ SEO Tổng Thể](https://terusvn.com/seo/dich-vu-seo-tong-the-uy-tin-hieu-qua-tai-terus/) Thiết kế website: · [Dịch vụ Thiết kế website chuẩn Insight](https://terusvn.com/thiet-ke-website/dich-vu-thiet-ke-website-chuan-insight-chuyen-nghiep-uy-tin-tai-terus/) · [Dịch vụ Thiết kế website](https://terusvn.com/thiet-ke-website-tai-hcm/)

terus_technique

Phương Pháp Tự Học Thiết Kế Website Miễn Phí

Bạn có ước mơ trở thành một lập trình viên website, nhưng chưa biết bắt đầu từ đâu? Đừng lo, Terus ở...

https://dev.to/terus_technique/phuong-phap-tu-hoc-thiet-ke-website-mien-phi-13f

website, digitalmarketing, seo, terus

 Bạn có ước mơ trở thành một lập trình viên website, nhưng chưa biết bắt đầu từ đâu? Đừng lo, Terus ở đây để đảm bảo rằng bạn hoàn toàn có thể tự học thiết kế website mà không cần phải bỏ ra số tiền lớn cho các khóa học. Thiết kế website là một lĩnh vực khá phức tạp, đòi hỏi người học phải nắm vững các kiến thức nền tảng về lập trình, giao diện người dùng, trải nghiệm người dùng và nhiều kỹ năng khác. Tuy nhiên, với sự hỗ trợ của các nguồn tài liệu miễn phí trên internet cùng với quyết tâm học tập, bạn hoàn toàn có thể tự mình xây dựng và phát triển những website ưng ý. Để có thể tự học [thiết kế website một cách hiệu quả](https://terusvn.com/thiet-ke-website-tai-hcm/), bạn cần phải tuân thủ một quy trình cụ thể, bao gồm các bước như: Lựa chọn hướng đi rõ ràng: Bạn nên xác định xem mình muốn theo hướng back-end developer hay front-end developer. Điều này sẽ giúp bạn tập trung vào việc học tập và phát triển các kỹ năng cần thiết. Tìm kiếm nguồn tài liệu học tập: Hãy tìm kiếm các website, kênh YouTube có liên quan đến thiết kế website để học hỏi. Các tài liệu này thường cung cấp các hướng dẫn cụ thể và miễn phí. Tìm hiểu về các công cụ lập trình web: Bạn cần nắm rõ các công cụ hỗ trợ lập trình web như HTML, CSS, JavaScript, các framework và thư viện phổ biến. Việc hiểu biết về các công cụ này sẽ giúp bạn xây dựng các trang web một cách hiệu quả. Luyện tập viết mã lệnh cơ bản: Hãy bắt đầu với các mã lệnh cơ bản như HTML, CSS và JavaScript. Luyện tập viết code và lồng ghép chúng với nhau sẽ giúp bạn nắm vững kiến thức nền tảng. Tái hiện các giao diện website mẫu: Thay vì bắt đầu từ con số 0, hãy tìm các mẫu website và cố gắng tái hiện lại chúng. Điều này sẽ giúp bạn nắm rõ hơn về cấu trúc và cách thức xây dựng một trang web. Xây dựng website từ đầu đến cuối: Khi đã nắm vững các kiến thức cơ bản, hãy bắt đầu xây dựng website từ đầu đến cuối. Hãy lên kế hoạch, thiết kế giao diện, lập trình và kiểm tra kỹ càng. Kiểm tra và hoàn thiện: Đừng quên kiểm tra tính khả dụng và giao diện của website để đảm bảo nó hoạt động tốt và trải nghiệm của người dùng được tối ưu. Trong quá trình tự học, bạn cũng cần phải chú ý duy trì động lực học tập bằng cách thiết lập mục tiêu rõ ràng, chia nhỏ các công việc và tạo cho mình những thành tựu nhỏ để cảm thấy động viên. Bên cạnh đó, đừng quên kết nối và trao đổi với cộng đồng lập trình website để nhận được sự hỗ trợ và động viên. Tự học [thiết kế website](https://terusvn.com/thiet-ke-website-tai-hcm/) không hề dễ dàng, nhưng với quyết tâm, kỷ luật và phương pháp học tập phù hợp, bạn hoàn toàn có thể trở thành một lập trình viên web chuyên nghiệp mà không cần phải tốn một khoản tiền lớn cho các khóa học. Hãy bắt đầu hành trình của bạn ngay từ bây giờ! Tìm hiểu thêm về [Phương Pháp Tự Học Thiết Kế Website Miễn Phí](https://terusvn.com/thiet-ke-website/phuong-phap-tu-hoc-thiet-ke-website/) Các dịch vụ tại Terus: Digital Marketing: · [Dịch vụ Facebook Ads](https://terusvn.com/digital-marketing/dich-vu-facebook-ads-tai-terus/) · [Dịch vụ Google Ads](https://terusvn.com/digital-marketing/dich-vu-quang-cao-google-tai-terus/) · [Dịch vụ SEO Tổng Thể](https://terusvn.com/seo/dich-vu-seo-tong-the-uy-tin-hieu-qua-tai-terus/) Thiết kế website: · [Dịch vụ Thiết kế website chuẩn Insight](https://terusvn.com/thiet-ke-website/dich-vu-thiet-ke-website-chuan-insight-chuyen-nghiep-uy-tin-tai-terus/) · [Dịch vụ Thiết kế website](https://terusvn.com/thiet-ke-website-tai-hcm/)

terus_technique

Thiết Kế Website Năm 2024 Là Bao Gồm Những Việc Gì?

Website design, còn được biết đến với tên gọi thông thường là thiết kế website. Các ý tưởng của...

https://dev.to/terus_technique/thiet-ke-website-nam-2024-la-bao-gom-nhung-viec-gi-iel

website, digitalmarketing, seo, terus

 Website design, còn được biết đến với tên gọi thông thường là [thiết kế website](https://terusvn.com/thiet-ke-website-tai-hcm/). Các ý tưởng của khách hàng sẽ được thiết kế và lập trình bởi những người có chuyên môn trong thiết kế và lập trình, cũng như các bộ phận chuyên ngành khác, để tạo ra một [website hoàn chỉnh, chuyên nghiệp và uy tín](https://terusvn.com/thiet-ke-website-tai-hcm/). Các trang web này sẽ chứa nội dung liên quan đến các hoạt động của doanh nghiệp hoặc cửa hàng. Để làm phong phú cách truyền tải và tiếp cận nhiều người dùng hơn, những nội dung này có thể được hiển thị theo nhiều cách khác nhau, chẳng hạn như hình ảnh tĩnh động, văn bản hoặc video. Có hai loại website: website dạng tĩnh và website dạng động. Chọn dạng web phù hợp sẽ phụ thuộc vào ngân sách và nhu cầu sử dụng của mỗi bên. Sau đây là hai loại trang web: 1. Website tĩnh Các đoạn mã HTML, JAVASCRIPT và CSS sẽ được sử dụng trên các trang web tĩnh. Người dùng có thể truy cập mọi nội dung văn bản hay video hình ảnh hấp dẫn trên web tĩnh. Tuy nhiên, khi sử dụng trang web tĩnh của chủ cửa hàng, bạn sẽ không thể thay đổi hoặc cập nhật bất kỳ nội dung nào. Ngay cả các trang web tĩnh đều có bố cục và màu sắc cố định. Nếu bạn không có kiến thức lập trình chuyên sâu và kinh nghiệm xử lý những thay đổi trên một trang web tĩnh, thì việc chỉnh sửa loại hình web này gần như là không thể. Tạo lại một trang web hoàn toàn mới là cách duy nhất để duy trì thông tin cập nhật trên một trang web tĩnh. 2. Website động Thiết kế trang web dạng động sử dụng các ngôn ngữ lập trình phổ biến như JAVA, PHP, Python và Ruby, trái ngược hoàn toàn với trang web tĩnh. Web động cho phép người dùng linh hoạt trong việc thay đổi và sửa đổi nội dung trên trang web. Ngoài ra, bạn có thể thay đổi giao diện và đơn giản hóa bố cục và màu sắc. Website động hiện được sử dụng nhiều hơn do tính ứng dụng cao. Với đội ngũ thiết kế tài năng, giàu kinh nghiệm và nhiệt huyết, sản phẩm của Terus đem đến sẽ không thua bất kỳ một bên cung cấp nào khác. Chúng tôi sẵn sàng tư vấn cho bạn miễn phí. Với số lượng mẫu website khổng lồ với hơn 3000+ mẫu, chúng tôi tự tin có thể đáp ứng tối đa những yêu cầu mà bạn đưa ra. Cùng với chính sách bảo vệ quyền lợi khách hàng cực chất. Tìm hiểu thêm về [Thiết Kế Website Năm 2024 Là Bao Gồm Những Việc Gì?](https://terusvn.com/thiet-ke-website/thiet-ke-website-bao-gom-viec-gi/) Các dịch vụ tại Terus: Digital Marketing: · [Dịch vụ Facebook Ads](https://terusvn.com/digital-marketing/dich-vu-facebook-ads-tai-terus/) · [Dịch vụ Google Ads](https://terusvn.com/digital-marketing/dich-vu-quang-cao-google-tai-terus/) · [Dịch vụ SEO Tổng Thể](https://terusvn.com/seo/dich-vu-seo-tong-the-uy-tin-hieu-qua-tai-terus/) Thiết kế website: · [Dịch vụ Thiết kế website chuẩn Insight](https://terusvn.com/thiet-ke-website/dich-vu-thiet-ke-website-chuan-insight-chuyen-nghiep-uy-tin-tai-terus/) · [Dịch vụ Thiết kế website](https://terusvn.com/thiet-ke-website-tai-hcm/)

terus_technique

Welcome to businessgrape.com

Businessgrape.com offers business owners the invaluable service of free advertising. Since web sites...

https://dev.to/businessgrape/welcome-to-businessgrapecom-50nm

businessgrape

Businessgrape.com offers business owners the invaluable service of free advertising. Since web sites for small businesses are becoming mainstream and can be developed inexpensively, many web developers do not take the time or have the knowledge to program a web site to be search engine friendly.[https://www.businessgrape.com/](https://www.businessgrape.com/)

businessgrape

Thiết Kế Website Cao Cấp Là Như Thế Nào?

Thiết kế website cao cấp là một dịch vụ quan trọng đối với các doanh nghiệp muốn khẳng định thương...

https://dev.to/terus_technique/thiet-ke-website-cao-cap-la-nhu-the-nao-3gl7

website, digitalmarketing, seo, terus

 Thiết kế website cao cấp là một dịch vụ quan trọng đối với các doanh nghiệp muốn khẳng định thương hiệu và tăng sức cạnh tranh trên thị trường. Một website cao cấp không chỉ mang đến ấn tượng đầu tiên tốt đẹp với khách hàng mà còn giúp nâng cao giá trị thương hiệu, tăng doanh thu và xây dựng niềm tin cho khách hàng. Terus - một công ty hàng đầu về thiết kế website cao cấp, đã và đang cung cấp các dịch vụ thiết kế, phát triển và quản trị website chuyên nghiệp cho nhiều doanh nghiệp trong và ngoài nước. Với đội ngũ chuyên gia có nhiều năm kinh nghiệm, Terus cam kết mang đến những giải pháp website cao cấp, độc đáo và phù hợp với nhu cầu riêng của từng khách hàng. Các yêu cầu cơ bản của một thiết kế website cao cấp bao gồm: giao diện thẩm mỹ, tính năng nổi bật, tối ưu hóa trải nghiệm người dùng, tích hợp công nghệ hiện đại và đảm bảo an ninh, bảo mật. Đây là những tiêu chí quan trọng giúp website trở nên chuyên nghiệp, thu hút khách hàng và tăng giá trị cho thương hiệu. Khi lựa chọn [dịch vụ thiết kế website cao cấp](https://terusvn.com/thiet-ke-website-tai-hcm/), doanh nghiệp có thể nhận được nhiều lợi ích như: ấn tượng đầu tiên tốt, tăng khả năng cạnh tranh, tăng doanh thu và xây dựng niềm tin thương hiệu. Các website cao cấp thường được thiết kế với giao diện hiện đại, tối ưu trải nghiệm người dùng, tích hợp các tính năng tiện ích và công nghệ mới nhất, đáp ứng tối đa nhu cầu của khách hàng. Với quy trình này, Terus cam kết mang đến những website cao cấp, độc đáo và phù hợp với nhu cầu riêng của từng khách hàng. Các website được thiết kế không chỉ đẹp mắt mà còn tối ưu trải nghiệm người dùng, tăng khả năng tiếp cận và chuyển đổi khách hàng. Ngoài thiết kế website cao cấp, Terus còn cung cấp các dịch vụ khác như Digital Marketing, giải pháp quản lý và thiết kế phần mềm nhằm giúp doanh nghiệp có một hệ thống online toàn diện và hiệu quả. Với uy tín và kinh nghiệm lâu năm, Terus tự hào là đơn vị tiên phong trong [lĩnh vực thiết kế website cao cấp tại Việt Nam](https://terusvn.com/thiet-ke-website-tai-hcm/). Công ty cam kết mang đến những giải pháp website chuyên nghiệp, sáng tạo và mang lại hiệu quả kinh doanh tối ưu cho khách hàng. Tìm hiểu thêm về [Thiết Kế Website Cao Cấp Là Như Thế Nào?](https://terusvn.com/thiet-ke-website/terus-thiet-ke-website-cao-cap/) Các dịch vụ tại Terus: Digital Marketing: · [Dịch vụ Facebook Ads](https://terusvn.com/digital-marketing/dich-vu-facebook-ads-tai-terus/) · [Dịch vụ Google Ads](https://terusvn.com/digital-marketing/dich-vu-quang-cao-google-tai-terus/) · [Dịch vụ SEO Tổng Thể](https://terusvn.com/seo/dich-vu-seo-tong-the-uy-tin-hieu-qua-tai-terus/) Thiết kế website: · [Dịch vụ Thiết kế website chuẩn Insight](https://terusvn.com/thiet-ke-website/dich-vu-thiet-ke-website-chuan-insight-chuyen-nghiep-uy-tin-tai-terus/) · [Dịch vụ Thiết kế website](https://terusvn.com/thiet-ke-website-tai-hcm/)

terus_technique

Intro to PASETO with Java

In this article, we will first see what JWT (JSON Web Tokens) is and the issues associated with it....

https://dev.to/mohanapraneswaran/intro-to-paseto-with-java-4ol0

security, jwt, paseto, quarkus

In this article, we will first see what JWT (JSON Web Tokens) is and the issues associated with it. Then, we will introduce PASETO (Platform-Agnostic Security Tokens), highlighting its differences from JWT. We will also discuss the different types of PASETO tokens and provide a step-by-step guide on how to generate and validate PASETO tokens. ## What is JWT? JSON Web Token (JWT) is a compact, URL-safe way to transfer information between two parties. It contains three parts: a header, a payload, and a signature. The header includes the token type and signing algorithm, the payload contains claims about the user and additional data, and the signature verifies the token's authenticity. JWTs are commonly used in authentication systems, where a server generates a token after a user logs in, and the client uses this token to access protected resources. It is a base64 encoded string. ## Problems In JWT ### 1. Widely Misused: - Weak Signing Algorithms: JWT offers a variety of signing algorithms, some of which are known to be vulnerable. Developers may mistakenly choose a weak algorithm, leading to security risks. ### 2. Signing Algorithm in the Token Header: - Algorithm Confusion: The inclusion of the signing algorithm in the token header can lead to security issues. Attackers can modify the alg value in the header, potentially changing the signature verification method. If the implementation does not strictly enforce the expected algorithm, this can result in token forgery, allowing unauthorized access. ## What is PASETO? PASETO (Platform-Agnostic Security Tokens) is a modern security token format designed to be safer and more straightforward than JSON Web Tokens (JWT). Developed by Scott Arciszewski, PASETO addresses security issues inherent to JWT while promoting simplicity and robustness. ## PASETO structure: ``` v1.local.1_5gaMPojdToeX6Kc6CV751PlwowSrvMUYuVAApH5HOdEh3MSCf3fQ6xsf1_zSprLvcDqUxXZIjNbaaQfpz12d9kmoM8p8oVG5wI-n_4Xghh29eJoVm2kuJ9K4seOBRNWugwqVTTSCwHuJyAM-sWD9sCOIYCrUAa0VR4Z5_XIRbCxvN4xU3aplUoRpZUssFYkxdKWgr3DXc6nD1CkrcE40wUhOk-jGVI7-QSp4_JDcceV7RYigr5q4KFKHRfI65Oznh4ucRAQw ``` The first section of the PASETO is the protocol version (v2). This tells you what version of the PASETO standard is being used. At the time of writing, there are two versions of the PASETO standard. The second section of the PASETO is the purpose (local). PASETO only defines two purposes for tokens: local or public. I’ll expand on these later. For now, just know that the local purpose is the one I’m demonstrating here. The third section of the PASETO defines the actual token contents, also known as the payload: ## Uses for PASETO: you can use PASETOs for two different purposes: symmetric (aka local) and asymmetric (aka public). ### Local (Symmetric Encryption) Local PASETOs are created and encrypted using a secret key, which functions like a long password. If anyone obtains the local PASETO token, they cannot extract any useful information from it without the secret key. As long as the secret key remains secure, the PASETO is safe even if shared publicly. Use Case: You can use local PASETOs to verify one web service with another. For instance, a microservice architecture where an internal service needs to authenticate requests to another internal service can benefit from using local PASETOs. By encrypting the token with a shared secret key, only the intended service can decrypt and validate the token, ensuring secure communication between services. ### Public (Asymmetric Encryption) Public PASETOs use a pair of public and private keys for encryption. The private key is used to sign the token, and the public key is used to verify its authenticity. This method ensures that the token can be verified by anyone with the public key but only signed by the private key. Use Case: Public PASETOs are ideal for scenarios where you need to ensure that a token's authenticity can be verified by multiple parties without exposing the private key. For example, in a distributed system where different clients need to validate the token's authenticity, public PASETOs provide a secure solution. Only the server with the private key can sign the token, but any client with the public key can verify it, maintaining the token's integrity and trustworthiness. ## Difference between JWT and PASETOs:  ## PASETO in Quarkus To create and use PASETO in a Quarkus project, follow these steps. This example uses Gradle as the build tool, but you can also use Maven if you prefer. ### 1. Create a Quarkus Project First, create a new Quarkus project. You can do this using the Quarkus CLI or through the Quarkus website. ### 2. Add Dependencies Add the following dependencies to your build.gradle file. For Maven users, search for the corresponding dependencies in the Maven repository and add them to your pom.xml. ``` implementation 'dev.paseto:jpaseto-api:0.7.0' implementation 'dev.paseto:jpaseto-impl:0.7.0' implementation 'dev.paseto:jpaseto-jackson:0.7.0' implementation 'dev.paseto:jpaseto-bouncy-castle:0.7.0' ``` ### 3. Implement PASETO Creation ``` package com.grootan; import dev.paseto.jpaseto.Pasetos; import dev.paseto.jpaseto.lang.Keys; import jakarta.ws.rs.GET; import jakarta.ws.rs.Path; import jakarta.ws.rs.Produces; import jakarta.ws.rs.core.MediaType; import javax.crypto.SecretKey; import java.time.Instant; import java.time.temporal.ChronoUnit; import java.util.Random; @Path("/token/create") public class CreateTokenService { public static final SecretKey SHARED_SECRET = Keys.secretKey(); @GET @Produces(MediaType.TEXT_PLAIN) public String createToken() { Instant now = Instant.now(); String token = Pasetos.V1.LOCAL.builder() .setSharedSecret(SHARED_SECRET) .setIssuedAt(now) .setExpiration(now.plus(1, ChronoUnit.HOURS)) .setAudience("blog") .setIssuer("https://ezto.io/") .claim("1d20", new Random().nextInt(20) + 1) .compact(); return token; } } ``` A PASETO token is then created using the Pasetos.V1.LOCAL.builder(). The following claims and properties are set on the token: 1. setSharedSecret(SHARED_SECRET): Sets the shared secret key used for encryption. 2. setIssuedAt(now): Sets the issued-at timestamp to the current time. 3. setExpiration(now.plus(1, ChronoUnit.HOURS)): Sets the expiration time to one hour from now. 4. setAudience("blog"): Sets the audience claim to "blog". 5. setIssuer("https://ezto.io/"): Sets the issuer claim to the specified URL. 6. claim("1d20", new Random().nextInt(20) + 1): Adds a custom claim, simulating a random dice roll between 1 and 20. The compact() method finalizes the token creation process, returning the token as a string. You can make get request to this API to get your PASETO. ## 4. Implement PASETO Verification: ``` package com.grootan; import dev.paseto.jpaseto.Paseto; import dev.paseto.jpaseto.PasetoParser; import dev.paseto.jpaseto.Pasetos; import dev.paseto.jpaseto.Version; import dev.paseto.jpaseto.lang.Keys; import jakarta.ws.rs.POST; import jakarta.ws.rs.Path; import jakarta.ws.rs.Produces; import jakarta.ws.rs.core.MediaType; import java.security.KeyPair; import static com.grootan.CreateTokenService.SHARED_SECRET; @Path("/token/verify") public class VerifyTokenService { private static final KeyPair KEY_PAIR = Keys.keyPairFor(Version.V1); @POST @Produces(MediaType.TEXT_PLAIN) public String verifyToken(String token) { PasetoParser parser = Pasetos.parserBuilder() .setSharedSecret(SHARED_SECRET) .setPublicKey(KEY_PAIR.getPublic()) .requireAudience("blog") .requireIssuer("https://ezto.io/") .build(); Paseto result = parser.parse(token); return result.getClaims().getIssuer(); } } ``` PasetoParser is built using the Pasetos.parserBuilder() method. The parser is configured with: 1. setSharedSecret(SHARED_SECRET): The shared secret key used for symmetric encryption. 2. setPublicKey(KEY_PAIR.getPublic()): The public key used for asymmetric encryption. 3. requireAudience("blog"): A requirement that the token must have the audience "blog". 4. requireIssuer("https://ezto.io/"): A requirement that the token must have the issuer "https://ezto.io/". The token is parsed using the parser.parse(token) method, which returns a Paseto object. If the token is valid, this method returns the issuer claim from the token. You can make a post request with the token to this API to verify your PASETO. ## Limitations of PASETO While PASETO (Platform-Agnostic Security Tokens) offers several improvements over JWT (JSON Web Tokens), it also has its own set of limitations. Here are some key limitations to consider: ### Ecosystem: - The ecosystem around PASETO is not as mature as JWT’s. There are fewer implementations and integrations available for various programming languages and frameworks. - Limited Documentation: Compared to JWT, there is less documentation, tutorials, and examples available for PASETO, which can hinder learning and adoption. ### Learning Curve: - New Concepts: For developers familiar with JWT, PASETO introduces new concepts and a different approach to security tokens. This can require additional learning and adjustment. - Complexity: Understanding and correctly implementing the PASETO specification can be more complex for developers new to it. ### Interoperability: - Compatibility: Since JWT is more widely adopted, many systems and services are built around JWT. This can make interoperability with existing systems challenging if they do not support PASETO. - Tooling and Infrastructure: Existing tools, middleware, and infrastructure might not support PASETO, requiring additional effort to integrate or replace these components. ### Algorithm Support: - Fixed Algorithms: PASETO uses fixed algorithms for each version (e.g., AES-256-GCM for local tokens in v1). While this increases security by reducing the risk of weak algorithms, it also limits flexibility for developers who might need different algorithm choices for specific use cases. - Version Constraints: PASETO versions (v1, v2, etc.) have strict rules about which algorithms can be used, which might not suit all cryptographic needs. ### Specification Evolution: - Standard Maturity: As PASETO is relatively new, its specification is still evolving. Future changes to the specification could introduce breaking changes or require updates to existing implementations. In summary, exploring PASETO as an alternative to JWT reveals its potential for simplifying and enhancing token-based authentication. Understanding these differences equips developers with valuable tools to secure their applications effectively.

mohanapraneswaran

Thiết Kế Website Bằng AI – Trí Tuệ Nhân Tạo Liệu Có Khả Thi?

Trí tuệ nhân tạo (AI) đề cập đến khả năng của máy tính và hệ thống máy tính để thực hiện các nhiệm...

https://dev.to/terus_technique/thiet-ke-website-bang-ai-tri-tue-nhan-tao-lieu-co-kha-thi-5cel

website, digitalmarketing, seo, terus

 Trí tuệ nhân tạo (AI) đề cập đến khả năng của máy tính và hệ thống máy tính để thực hiện các nhiệm vụ thông minh như con người, như học hỏi, nhận thức, lập luận và giải quyết vấn đề. AI được phát triển bằng cách sử dụng các thuật toán máy học để mô phỏng và cải thiện quá trình tư duy của con người. Việc sử dụng AI trong thiết kế website liên quan đến việc sử dụng các công cụ và thuật toán dựa trên AI để hỗ trợ và tự động hóa một số khía cạnh của quá trình thiết kế. Điều này có thể bao gồm tạo mẫu, bố cục, chọn màu sắc, chọn phông chữ và thậm chí là tạo nội dung. AI có thể hỗ trợ thiết kế giao diện người dùng (UI) bằng cách phân tích dữ liệu về hành vi người dùng, xu hướng thiết kế và các yếu tố thẩm mỹ khác. Từ đó, AI có thể tự động tạo ra các mẫu UI phù hợp với nhu cầu của người dùng. Ngoài việc hỗ trợ UI, AI cũng có thể được sử dụng để cải thiện trải nghiệm người dùng (UX) thông qua việc phân tích dữ liệu hành vi người dùng, tối ưu hóa điều hướng và giao diện, và đưa ra các đề xuất cá nhân hóa. AI có thể được sử dụng như một công cụ chẩn đoán, phát hiện và sửa lỗi trong quá trình [thiết kế website](https://terusvn.com/thiet-ke-website-tai-hcm/). Nó có thể phân tích các yếu tố như tốc độ tải trang, khả năng tiếp cận và tối ưu hóa SEO để đưa ra các khuyến nghị cải thiện. Việc áp dụng AI trong các [dịch vụ thiết kế website](https://terusvn.com/thiet-ke-website-tai-hcm/) đang trở nên ngày càng phổ biến và mang lại nhiều lợi ích như tăng năng suất, cải thiện trải nghiệm người dùng và giảm chi phí. Tuy nhiên, cũng có một số thách thức như tính bảo mật, sự phụ thuộc và sự thiếu sáng tạo. Các doanh nghiệp cần cẩn trọng trong việc áp dụng AI và kết hợp nó một cách hiệu quả với các kỹ năng thiết kế truyền thống để đạt được lợi thế cạnh tranh. Tìm hiểu thêm về [Thiết Kế Website Bằng AI – Trí Tuệ Nhân Tạo Liệu Có Khả Thi?](https://terusvn.com/thiet-ke-website/terus-thiet-ke-website-bang-ai/) Các dịch vụ tại Terus: Digital Marketing: · [Dịch vụ Facebook Ads](https://terusvn.com/digital-marketing/dich-vu-facebook-ads-tai-terus/) · [Dịch vụ Google Ads](https://terusvn.com/digital-marketing/dich-vu-quang-cao-google-tai-terus/) · [Dịch vụ SEO Tổng Thể](https://terusvn.com/seo/dich-vu-seo-tong-the-uy-tin-hieu-qua-tai-terus/) Thiết kế website: · [Dịch vụ Thiết kế website chuẩn Insight](https://terusvn.com/thiet-ke-website/dich-vu-thiet-ke-website-chuan-insight-chuyen-nghiep-uy-tin-tai-terus/) · [Dịch vụ Thiết kế website](https://terusvn.com/thiet-ke-website-tai-hcm/)

terus_technique

Scenario based practices for securing an AWS S3 bucket.

Scenario: You have an AWS S3 bucket named my-example-bucket where you store sensitive documents. You...

https://dev.to/nooruddin-zubair/scenario-based-practices-for-securing-an-aws-s3-bucket-10bh

beginners, aws, learning, security

**Scenario:** You have an AWS S3 bucket named **my-example-bucket** where you store sensitive documents. You want to ensure the bucket is secure according to AWS S3 best practices. **Solution Steps:** **1. Enable Versioning:** Versioning helps protect against accidental deletion or modification of objects. **Action:** Enable versioning on the **my-example-bucket**. **How:** Using AWS Management Console: Navigate to the S3 console. Select **my-example-bucket**. Click on the **Properties** tab. Under **Advanced settings**, select **Versioning**. Click **Enable versioning**. **2. Configure Bucket Policies:** Implement a bucket policy to restrict access based on the principle of least privilege. **Action:** Create a bucket policy that allows only specific IAM users or roles to access the bucket. **Example Policy** (replace **my-example-bucket** and **arn:aws:iam::123456789012:user/authorized-user** with your actual bucket name and IAM user ARN):  { "Version": "2012-10-17", "Statement": [ { "Effect": "Allow", "Principal": { "AWS": "arn:aws:iam::123456789012:user/authorized-user" }, "Action": [ "s3:GetObject", "s3:PutObject", "s3:DeleteObject" ], "Resource": [ "arn:aws:s3:::my-example-bucket/*" ] } ] } **How:** Using AWS Management Console: Navigate to the S3 console. Select **my-example-bucket**. Click on the **Permissions** tab. Click **Bucket Policy**. Paste the JSON policy above, modifying it with your specific IAM user ARN and bucket name. **3. Enable Server-Side Encryption (SSE):** Encrypt data at rest to protect sensitive information stored in the bucket. **Action:** Enable SSE for objects uploaded to **my-example-bucket**. **How:** Using AWS Management Console: Navigate to the S3 console. Select **my-example-bucket**. Click on the **Properties** tab. Under **Default encryption**, click **Edit**. Select **AES-256** (SSE-S3) or **AWS-KMS** (SSE-KMS). Click **Save**. **4. Enable Logging and Monitoring:** Enable access logging to track requests made to **my-example-bucket**. **Action:** Enable logging to record access requests for audit and compliance purposes. **How:** Using AWS Management Console: Navigate to the S3 console. Select **my-example-bucket**. Click on the **Properties** tab. Under **Server access logging**, click **Edit**. Select **Enable logging**. Specify a target bucket and prefix for storing log files. Click **Save**. **5. Regular Audits and Reviews:** Regularly review access permissions, policies, and configurations for **my-example-bucket** to ensure security best practices are maintained. **Action:** Schedule periodic audits to review bucket policies, IAM roles, and access logs. **How:** Manually or using AWS Config and AWS CloudTrail for automated monitoring and auditing. **Summary:** By following these steps, you've implemented several AWS S3 security best practices for **my-example-bucket**: - Ensured data protection with versioning and encryption. - Controlled access with a bucket policy based on least privilege. - Enhanced visibility and accountability with access logging. These practices help secure your sensitive documents stored in AWS S3 and mitigate risks associated with unauthorized access or accidental data loss.

nooruddin-zubair

Cilium no EKS [Lab Session]

eBPF-based Networking, Observability, Security Cilium is an open source, cloud native solution for...

https://dev.to/aws-builders/cilium-no-eks-lab-session-1dom

community, kubernetes, cilium, ebpf

> **eBPF-based Networking, Observability, Security** > Cilium is an open source, cloud native solution for providing, securing, and observing network connectivity between workloads, fueled by the revolutionary Kernel technology eBPF > _Source: https://cilium.io/_ **Network & Service Mesh (sidecarless)**   {% embed https://youtu.be/e10kDBEsZw4?si=RESMnqdWvibBaJMw %} Source: https://cilium.io/ --- ## Arquitetura do Lab  Repositórios: - EKS: https://github.com/paulofponciano/EKS-Cilium - App Microsserviços: https://github.com/msfidelis/nutrition-overengineering ## Deploy da infra ```sh git clone https://github.com/paulofponciano/EKS-Cilium.git ``` ```sh cd EKS-Cilium ``` > Altere as variáveis necessárias para o seu lab em [_variables.tfvars_](https://github.com/paulofponciano/EKS-Cilium/blob/main/variables.tfvars) ```sh tofu init ``` ```sh tofu plan --var-file variables.tfvars ``` ```sh tofu apply --var-file variables.tfvars ```  Por padrão, o EKS vai subir com Amazon VPC CNI, podemos ver o DaemonSet 'aws-node'. No cenário desse lab, removemos esse DaemonSet e fazemos a reciclagem dos nodes - Executando um **Terminate** nos nodes atuais. Com isso, o EKS vai subir novos nodes para o replace. Como CNI, utilizamos o Cilium. ```sh kubectl get ds -A ``` ```sh kubectl delete ds aws-node -n kube-system ```  O **Terminate** dos nodes iniciais pode ser feito na console ou CLI. ⚠️ É importante tomar cuidado nessa ação para não afetar nenhum outro recurso que não seja do lab.  Após a reciclagem dos nodes, podemos ver que está tudo certo no namespace 'kube-system':  Usando o **cilium-cli**, podemos ver o status do Cilium neste cluster: ```sh cilium status ```  Se conectarmos diretamente em um node, podemos ver a _conflist_ do Cilium CNI:  ## Deploy da app Utilizamos uma app baseada em microsserviços, do Grande Matheus Fidelis [@fidelissauro](https://x.com/fidelissauro). Valeu Matheus! Essa app utiliza gRPC em sua comunicação interna. ```sh git clone https://github.com/msfidelis/nutrition-overengineering.git ``` ```sh cd nutrition-overengineering/samples/cilium ``` Ajuste o 'host' no manifesto de ingress da [health-api](https://github.com/msfidelis/nutrition-overengineering/blob/main/samples/cilium/health-api.yml) se necessário. Aqui ficou assim: ```yaml apiVersion: networking.k8s.io/v1 kind: Ingress metadata: name: health-api namespace: health-api spec: ingressClassName: cilium rules: - host: health-api.pauloponciano.digital http: paths: - backend: service: name: health-api port: number: 8080 path: / pathType: Prefix ``` Foi criado manualmente um registro no DNS público apontando o host para o CNAME do Network Load Balancer. Apply dos manifestos: ```sh kubectl apply -f . ```  Podemos fazer um teste rápido e ver o retorno da api: ```sh for i in {1..3} do curl --location --request POST 'http://health-api.pauloponciano.digital/calculator' \ --header 'Content-Type: application/json' \ --data-raw '{ "age": 26, "weight": 90.0, "height": 1.77, "gender": "M", "activity_intensity": "very_active" }' --silent | jq . done ```  ## Hubble UI e Prometheus Da mesma forma que foi criado o registro no DNS público para a _health-api_, também foram criados registros para acesso ao hubble-ui e o grafana (o grafana faz parte do kube-prometheus-stack). Vamos aumentar a volume na _health-api_ utilizando o k6 com script abaixo: ```js import http from 'k6/http'; export default function () { const url = 'http://health-api.pauloponciano.digital/calculator'; const payload = JSON.stringify({ age: 26, weight: 90.0, height: 1.77, gender: 'M', activity_intensity: 'very_active', }); const params = { headers: { 'Content-Type': 'application/json', }, }; const response = http.post(url, payload, params); console.log(response.body); } ``` ```sh k6 run http_k6.js --vus=200 --duration=60m ```  Agora podemos ver no Hubble as interações entre os serviços muito próximo do _real time_:    Como ele é interativo, é possível ver mais detalhes das conexões focando em cada componente:  Agora vamos dar uma olhada no Grafana. Quando foi feito o deploy do **kube-prometheus-stack** via Helm na execução de terraform, também foram importados dois dashboards:  Acessando o dashboard **Hubble L7 HTTP Metrics by Workload**, podemos ver algumas métricas dos microsserviços. **health-api:**  **recommendations-grpc:**  **imc-grpc:**  ## Tetragon e Loki O **Tetragon** também é executado como um DaemonSet. Com ele podemos ver as _Syscalls_ que estão acontecendo no ambiente e ele tem a capacidade de fazer _enforce_. No lab, foi feito deploy do **Promtail + Loki**, com eles, guardamos esses eventos do Tetragon em uma bucket do S3 e podemos visualizar no Grafana. **Tetragon Events** dashboard:  Executando aleatoriamente alguns comandos de 'kubectl exec', e com as queries do Loki já configuradas, pegamos alguns eventos que podem ser considerados maliciosos. Isso graças a quantidade de informações que o Tetragon gera:   --- Recomendo de verdade que assistam a talk do Matheus Fidelis na LINUXtips, mostrando isso ao vivo e com as explicações sobre o poder e as possibilidades que o eBPF proporciona para tecnologias como o Cilium. {% embed https://www.youtube.com/watch?v=U7pNEmsjT40&t=15118s %} --- Keep shipping! 🐳

paulofponciano

A Curated Guide to Frontend System Design: Essential Concepts and Topics

In today's tech landscape, mastering system design is crucial for cracking coding interviews and...

https://dev.to/digital_subham/a-curated-guide-to-frontend-system-design-essential-concepts-and-topics-n2i

webdev, javascript, systemdesign, programming

In today's tech landscape, mastering system design is crucial for cracking coding interviews and advancing your career. This guide covers key areas and concepts essential for frontend system design. But thinking of what to study in system design is very confusing there are lots of thing that comes inside it. so i google it and created a list. ## Mastering Frontend System Design: A Comprehensive Guide In today's tech landscape, mastering system design is crucial for cracking coding interviews and advancing your career. This guide covers key areas and concepts essential for frontend system design. ### Key Areas in System Design 1. **Networking** - **How the Web Works**: Understand the fundamentals of how data travels across the web. - **Communication Protocols**: Learn about HTTP, HTTPS, and other protocols that enable web communication. - **REST APIs**: Explore REST principles for building scalable web services. - **GraphQL**: Discover how GraphQL allows for more efficient and flexible data queries. - **gRPC**: Investigate gRPC for high-performance remote procedure calls. 2. **Communication** - **Short Polling**: Poll the server at regular intervals for updates. - **Long Polling**: Maintain a connection until the server has new information. - **Web Sockets**: Enable real-time, bidirectional communication between client and server. - **Server-Side Events**: Push updates from the server to the client over a single connection. - **Web Hooks**: Set up HTTP callbacks to notify external systems of events. 3. **Security** - **XSS (Cross-Site Scripting)**: Protect against malicious scripts injected into web pages. - **iFrame Protection**: Prevent clickjacking and other iFrame-based attacks. - **Security Headers**: Use HTTP headers to enhance security measures. - **Client-Side Security**: Safeguard data and interactions on the client side. - **Secure Communication (HTTPS)**: Encrypt data in transit to protect against interception. - **Dependency Security**: Manage and secure third-party dependencies. - **Compliance and Regulations**: Adhere to legal and industry standards. - **Input Validation and Sanitization**: Ensure input data is clean and safe. - **SSRF (Server-Side Request Forgery)**: Mitigate attacks where the server makes unintended requests. - **Feature Policy**: Control which web features can be used in your application. - **Server-Side JavaScript Injection**: Prevent unauthorized code execution on the server. - **SRI (Subresource Integrity)**: Verify the integrity of resources loaded externally. - **CORS (Cross-Origin Resource Sharing)**: Manage cross-origin requests securely. - **CSRF (Cross-Site Request Forgery)**: Protect against unauthorized actions on behalf of a user. 4. **Testing** - **Unit and Integration Testing**: Test individual units and their integration. - **E2E and Automation Testing**: Perform end-to-end tests to simulate real user interactions. - **A/B Testing**: Compare two versions of a webpage to determine which performs better. - **Performance Testing**: Measure the responsiveness and stability of your application. - **Test-Driven Development**: Write tests before coding to ensure functionality. - **Security Testing**: Assess the security of your application against vulnerabilities. 5. **Performance** - **Performance Overview**: Understand the key aspects of web performance. - **Performance Importance**: Learn why performance matters for user experience. - **Performance Monitoring**: Continuously track performance metrics. - **Performance Tools**: Use tools to diagnose and fix performance issues. - **Rendering Patterns**: Optimize how content is rendered on the screen. 6. **Database & Caching** - **Local Storage**: Store data locally within the user's browser. - **Session Storage**: Keep data available for the duration of the page session. - **Cookie Storage**: Use cookies to store small amounts of data persistently. - **IndexedDB**: Utilize a low-level API for large-scale storage in the browser. - **Normalization**: Structure your database to reduce redundancy. - **HTTP Caching**: Cache HTTP responses to improve load times. - **Service Worker Caching**: Use service workers for offline capabilities. - **API Caching**: Cache API responses to reduce load on servers. - **State Management**: Manage the state of your application efficiently. 7. **Logging and Monitoring** - **Telemetry**: Collect and analyze data about application usage and performance. - **Alerting**: Set up alerts for critical issues and performance degradation. - **Fixing Issues**: Identify and resolve issues based on logs and monitoring data. 8. **Accessibility** - **Keyboard Accessibility**: Ensure all functionality is accessible via keyboard. - **Screen Reader**: Support screen readers for visually impaired users. - **Focus Management**: Manage focus order for a seamless user experience. - **Color Contrast**: Maintain sufficient contrast for readability. - **Accessibility Tools**: Use tools to identify and fix accessibility issues. - **Fixing Accessibility Issues**: Implement fixes to improve accessibility compliance. ### Detailed Design Concepts #### Low-Level Design (LLD) - **Component Design**: Design reusable and modular UI components. - **Config-Driven UI**: Create UIs driven by configuration data. - **Shimmer UI**: Implement loading animations to enhance user experience. - **Routing & Protected Routes**: Manage navigation and protect routes in your app. - **State Management + Libraries**: Handle application state using libraries like Redux. - **Multi-Language Support**: Support multiple languages in your application. - **Infinite Scroll**: Load content dynamically as the user scrolls. - **Accordion**: Implement collapsible sections for content organization. - **Nested Comments**: Design a system for threaded comments. - **Image Slider**: Create interactive image sliders for media content. - **Pagination**: Divide content into pages for better navigation. - **Real-Time Updates**: Push updates to the UI in real time. - **Live Chat**: Implement a live chat feature. - **Search**: Build an efficient search functionality. #### High-Level Design (HLD) - **Photo Sharing App (Instagram)**: Design a scalable photo-sharing platform. - **Ecommerce App (Amazon, Flipkart)**: Architect an online shopping system. - **News Media Feed (X)**: Create a news feed system. - **Video Streaming (Netflix)**: Design a video streaming service. - **Music Streaming (Spotify)**: Architect a music streaming platform. - **Live Commentary (CricBuzz)**: Build a system for live sports commentary. - **Email Client (Gmail)**: Design an email client with advanced features. - **Google Docs**: Create a collaborative document editing tool. - **Google Sheets**: Architect a collaborative spreadsheet application. - **Diagram Tools (Excalidraw)**: Design an interactive diagramming tool. - **Cab Services (Uber, Ola, Rapido)**: Build a ride-hailing service. - **Analytics Dashboard (Google Analytics)**: Create an analytics dashboard. - **Edtech Platform (Bloom Tuition)**: Design an online education platform. ### Conclusion System design is a vast field, but breaking it down into these categories can make it more manageable. Dive into each area, understand the core concepts, and practice designing systems. Happy learning! In upcoming articles, I will delve deeper into each topic and provide detailed explanations. If there are any topics I haven't listed, please let me know in the comments, and I will update the article accordingly.

digital_subham

Cách Để Kiểm Tra Tốc Độ Website Của Bạn Chuẩn Nhất Hiện Tại

Tốc độ website là một trong những yếu tố then chốt để đánh giá hiệu suất và trải nghiệm người dùng...

https://dev.to/terus_technique/cach-de-kiem-tra-toc-do-website-cua-ban-chuan-nhat-hien-tai-10de

website, digitalmarketing, seo, terus

 Tốc độ website là một trong những yếu tố then chốt để đánh giá [hiệu suất và trải nghiệm người dùng của một website](https://terusvn.com/thiet-ke-website-tai-hcm/). Hầu hết các trang web đều nhận thức được tầm quan trọng của tốc độ tải trang đối với việc giữ chân người dùng và tăng tỷ lệ chuyển đổi, vì vậy việc nghiên cứu và tối ưu hóa tốc độ tải trang luôn là điều quan trọng. Tốc độ website bao gồm 3 khái niệm chính: tốc độ website, tốc độ trang và tốc độ load. Tốc độ website đề cập đến thời gian tải toàn bộ trang web, bao gồm cả các tệp media và các yếu tố động. Tốc độ trang là thời gian tải một trang duy nhất trên website. Và tốc độ load là thời gian cần thiết để một trang web hoặc một phần của trang web được tải và hiển thị hoàn chỉnh trên trình duyệt. Quy trình tải và hiển thị một trang web bao gồm nhiều bước như truy vấn DNS, tải HTML, tải các file CSS/JS, tải các tệp media, và cuối cùng là hiển thị trang web hoàn chỉnh. Các bước này ảnh hưởng đến tổng thời gian tải trang. Tốc độ website có thể nhanh hoặc chậm tùy thuộc vào nhiều yếu tố như kết nối internet, cấu hình máy chủ, mã nguồn website, nội dung đa phương tiện,... Một website tải nhanh sẽ mang lại trải nghiệm tốt hơn cho người dùng, trong khi website tải chậm có thể khiến người dùng bỏ cuộc. Tốc độ website đóng vai trò quan trọng trong việc: Nâng cao trải nghiệm người dùng: Người dùng mong đợi một trang web tải nhanh và phản hồi tức thì. Tốc độ website chậm có thể dẫn đến người dùng rời khỏi trang web. Tăng tỷ lệ chuyển đổi: Tốc độ website nhanh góp phần tăng tỷ lệ chuyển đổi của trang web, như đặt hàng, đăng ký,... Hỗ trợ tăng hạng SEO website: Tốc độ tải trang là một trong những yếu tố quan trọng ảnh hưởng đến xếp hạng tìm kiếm của Google. Có nhiều công cụ có thể sử dụng để kiểm tra tốc độ website, như Google Pagespeed Insight, Load Impact, Think with Google, Pingdom Tool, và Alexa Traffic Rank. Các công cụ này cung cấp thông tin chi tiết về tốc độ tải trang, điểm số tối ưu hóa, và các gợi ý cải thiện. Khi sử dụng các công cụ kiểm tra [tốc độ website](https://terusvn.com/thiet-ke-website-tai-hcm/), người dùng cần xem xét các yếu tố như thời gian tải trang, điểm số tối ưu hóa, các lỗi và cảnh báo, và so sánh với các trang web khác trong cùng ngành. Từ đó, họ có thể diễn giải kết quả và triển khai các biện pháp cải thiện tốc độ tải trang. Việc kiểm tra tốc độ website thường xuyên và áp dụng các biện pháp tối ưu hóa là rất quan trọng để nâng cao trải nghiệm người dùng, tăng tỷ lệ chuyển đổi, và cải thiện thứ hạng SEO của trang web. Tìm hiểu thêm về [Cách Để Kiểm Tra Tốc Độ Website Của Bạn Chuẩn Nhất Hiện Tại](https://terusvn.com/thiet-ke-website/cach-de-kiem-tra-toc-do-website/) Các dịch vụ tại Terus: Digital Marketing: · [Dịch vụ Facebook Ads](https://terusvn.com/digital-marketing/dich-vu-facebook-ads-tai-terus/) · [Dịch vụ Google Ads](https://terusvn.com/digital-marketing/dich-vu-quang-cao-google-tai-terus/) · [Dịch vụ SEO Tổng Thể](https://terusvn.com/seo/dich-vu-seo-tong-the-uy-tin-hieu-qua-tai-terus/) Thiết kế website: · [Dịch vụ Thiết kế website chuẩn Insight](https://terusvn.com/thiet-ke-website/dich-vu-thiet-ke-website-chuan-insight-chuyen-nghiep-uy-tin-tai-terus/) · [Dịch vụ Thiết kế website](https://terusvn.com/thiet-ke-website-tai-hcm/)

terus_technique

Landing Page Với Website Có Đặc Điểm Gì Khác Nhau?

Landing page và website là những khái niệm khác nhau, mặc dù cả hai đều là các trang web trực...

https://dev.to/terus_technique/landing-page-voi-website-co-dac-diem-gi-khac-nhau-72n

website, digitalmarketing, seo, terus

 Landing page và website là những khái niệm khác nhau, mặc dù cả hai đều là các trang web trực tuyến. Landing page là một trang web độc lập, chuyên dụng được tạo ra với mục đích thu hút và chuyển đổi khách truy cập thành khách hàng tiềm năng hoặc thực hiện một hành động cụ thể như đăng ký, mua hàng,... [Landing page](https://terusvn.com/thiet-ke-website-tai-hcm/) thường có nội dung và giao diện tập trung vào một mục tiêu duy nhất. Website là một tập hợp các trang liên kết với nhau, cung cấp thông tin tổng thể về một tổ chức, công ty hay cá nhân. Website có thể bao gồm nhiều trang với các mục đích và nội dung khác nhau. Sự khác biệt giữa Landing Page và Website Số lượng trang và địa chỉ URL: Landing page thường chỉ có một trang web độc lập, trong khi website có nhiều trang web liên kết với nhau thông qua các URL khác nhau. Giao diện: Landing page thường có giao diện và nội dung tập trung vào một mục tiêu duy nhất, trong khi website có thể có nhiều trang với các giao diện và nội dung khác nhau. Mục đích sử dụng: Landing page được tạo ra với mục đích thu hút và chuyển đổi khách truy cập, trong khi website cung cấp thông tin tổng thể về một tổ chức, công ty hay cá nhân. So sánh hiệu quả giữa Landing Page và Website Hiệu quả thu hút sự chú ý: Landing page thường thu hút sự chú ý tốt hơn vì nội dung và thiết kế tập trung vào một mục tiêu duy nhất. Thúc đẩy quyết định mua hàng: Landing page có hiệu quả cao hơn trong việc thúc đẩy quyết định mua hàng vì tập trung vào một hành động chuyển đổi cụ thể. Tối ưu tỷ lệ chuyển đổi: Landing page dễ dàng tối ưu hóa tỷ lệ chuyển đổi hơn so với website vì tập trung vào một mục tiêu duy nhất. Đối với các [nhà cung cấp dịch vụ thiết kế website](https://terusvn.com/thiet-ke-website-tai-hcm/), Landing page và website là hai khái niệm khác nhau về mục đích, giao diện và hiệu quả. Landing page được tạo ra với mục đích thu hút và chuyển đổi khách truy cập, trong khi website cung cấp thông tin tổng thể về một tổ chức, công ty hay cá nhân. Việc sử dụng cả hai là cần thiết để tối ưu hóa chiến lược marketing trực tuyến. Tìm hiểu thêm về [Landing Page Với Website Có Đặc Điểm Gì Khác Nhau?](https://terusvn.com/thiet-ke-website/landing-page-va-website-khac-nhau/) Các dịch vụ tại Terus: Digital Marketing: · [Dịch vụ Facebook Ads](https://terusvn.com/digital-marketing/dich-vu-facebook-ads-tai-terus/) · [Dịch vụ Google Ads](https://terusvn.com/digital-marketing/dich-vu-quang-cao-google-tai-terus/) · [Dịch vụ SEO Tổng Thể](https://terusvn.com/seo/dich-vu-seo-tong-the-uy-tin-hieu-qua-tai-terus/) Thiết kế website: · [Dịch vụ Thiết kế website chuẩn Insight](https://terusvn.com/thiet-ke-website/dich-vu-thiet-ke-website-chuan-insight-chuyen-nghiep-uy-tin-tai-terus/) · [Dịch vụ Thiết kế website](https://terusvn.com/thiet-ke-website-tai-hcm/)

terus_technique

CRUD in Firebase

CRUD operation in Firebase using react and javascript // Read ...

https://dev.to/arunkrish11/crud-in-firebase-5hk3

firebase, reactjsdevelopment, react, webdev

CRUD operation in Firebase using react and javascript ``` // Read db.collection('products').get().then(resposne=>{ resposne.forEach((object)=>{ console.log(object.data(),object.id); }) }) // Create db.collection('products').add({ name: 'Laptop', type: 'Electronics', price: 50000 }).then(()=>{ console.log('Added'); }) // Delete db.collection('products').doc('Q4tjiYSC05MjYG6pQBIQ').delete().then(()=>{ console.log('Deleted'); }) // Update db.collection('products').doc('BDgu0r6ECRtyUKxxkxcs').update({ name: 'Laptop', type: 'Electronics', price: 50 }).then(()=>{ console.log('Updated'); }) ```

arunkrish11

Women's Cricket

[Women's Cricket]: Breaking Boundaries and Making History In the realm of sports, few stories are as...

https://dev.to/marzooqa_malik_c12ec0d9b9/womens-cricket-1g0i

cricket, women, lovers, entertainment

[[Women's Cricket](https://realcricket24.com/)]: Breaking Boundaries and Making History In the realm of sports, few stories are as inspiring and transformative as the rise of women's cricket. From its humble beginnings to becoming a global phenomenon, women's cricket has defied stereotypes, shattered glass ceilings, and captivated audiences worldwide. Let's delve into the evolution, achievements, and impact of women's cricket on the global stage. 1. Evolution and Growth Women's cricket traces its roots back to the late 19th century, with the first recorded women's cricket match taking place in 1745. However, it wasn't until the 20th century that the sport began to gain organized structure and recognition. Countries like England, Australia, and New Zealand led the way in developing women's cricket, establishing domestic leagues and international competitions. Over the decades, the popularity of women's cricket has grown exponentially, with more countries embracing the sport and investing in grassroots development. The inclusion of women's cricket in multi-national tournaments such as the ICC Women's World Cup and the ICC Women's T20 World Cup has been instrumental in elevating its profile and providing players with global exposure. 2. Pioneers and Trailblazers Throughout history, several pioneers have left an indelible mark on women's cricket. Players like Rachael Heyhoe-Flint (England), Belinda Clark (Australia), and Debbie Hockley (New Zealand) were instrumental in pushing the boundaries and advocating for greater recognition and opportunities for female cricketers. In recent years, the emergence of modern-day superstars such as Ellyse Perry (Australia), Mithali Raj (India), and Meg Lanning (Australia) has further propelled women's cricket into the spotlight. These athletes have not only excelled on the field with their skills and leadership but have also become role models for aspiring young cricketers around the world. 3. Achievements and Milestones Women's cricket has achieved significant milestones over the years, reflecting its rapid growth and evolution. The inaugural Women's Cricket World Cup was held in 1973, marking a historic moment for the sport. Since then, the tournament has grown in stature and competitiveness, showcasing the talent and determination of female cricketers from diverse backgrounds. The ICC Women's T20 World Cup, introduced in 2009, has also become a marquee event, drawing large crowds and media attention. The success of these tournaments has not only elevated the status of women's cricket but has also paved the way for increased investment, sponsorships, and professional opportunities for players. 4. Impact and Influence Beyond the boundary ropes, women's cricket has had a profound impact on society, challenging stereotypes and promoting gender equality in sports. The visibility of female athletes on the global stage has inspired young girls to pursue cricket and other sports, breaking down barriers and empowering them to dream big. Initiatives like the ICC Women's Cricket Development Program and various national cricket boards' efforts to promote women's cricket at grassroots levels have been pivotal in nurturing talent and fostering a supportive environment for female cricketers. 5. Future Prospects Looking ahead, the future of women's cricket appears promising and exciting. With increasing participation, professionalism, and fan engagement, women's cricket is poised to continue its upward trajectory. The expansion of domestic leagues, the inclusion of more teams in international competitions, and the growing investment in infrastructure and coaching are all contributing factors to the sport's sustained growth. As more countries embrace women's cricket and more opportunities become available, the stage is set for the next generation of female cricketers to leave their mark and inspire future champions. Conclusion Women's cricket has come a long way since its early days, evolving into a global phenomenon characterized by skill, passion, and determination. From grassroots development to international stardom, female cricketers have demonstrated their ability to compete at the highest level while inspiring generations of fans and athletes. As women's cricket continues to grow in popularity and influence, its impact on the sporting landscape and societal norms will undoubtedly leave a lasting legacy for years to come.

marzooqa_malik_c12ec0d9b9

Website Hosting Là Gì? Những Gì Bạn Cần Biết

Website hosting là dịch vụ cung cấp không gian trên máy chủ (server) để lưu trữ và phục vụ dữ liệu...

https://dev.to/terus_technique/website-hosting-la-gi-nhung-gi-ban-can-biet-31e1

website, digitalmarketing, seo, terus

 Website hosting là dịch vụ cung cấp không gian trên máy chủ (server) để lưu trữ và phục vụ dữ liệu cho các trang web. Các nhà cung cấp dịch vụ hosting (web hosting providers) sẽ chịu trách nhiệm về việc vận hành, bảo trì và cung cấp các tính năng cần thiết cho máy chủ, để đảm bảo website của người dùng hoạt động ổn định và an toàn 24/7. Tính năng chính của dịch vụ website hosting bao gồm: lưu trữ dữ liệu trang web, cấp phát tên miền, đảm bảo kết nối internet ổn định, cung cấp dung lượng lưu trữ và băng thông truyền tải phù hợp, cung cấp các công cụ quản trị website, và bảo mật dữ liệu. Nhờ đó, người dùng không cần phải tự quản lý máy chủ mà vẫn có thể triển khai và vận hành website của mình. Vai trò của website hosting đối với doanh nghiệp hiện nay là vô cùng quan trọng. Một [website chuyên nghiệp, ổn định và có hiệu suất cao](https://terusvn.com/thiet-ke-website-tai-hcm/) sẽ góp phần tăng uy tín, thu hút khách hàng và tối ưu hóa quá trình kinh doanh. Đặc biệt đối với các doanh nghiệp số hóa, website là kênh bán hàng, tiếp thị và giao tiếp chính với khách hàng. Có nhiều loại web hosting phổ biến như shared hosting, VPS hosting, dedicated hosting và cloud hosting, với các tính năng và mức giá khác nhau. Người dùng cần cân nhắc các yếu tố như dung lượng lưu trữ, băng thông, tính năng, bảo mật, hỗ trợ kỹ thuật và giá cả để lựa chọn gói hosting phù hợp. Các tiêu chí cần xem xét khi lựa chọn nhà cung cấp dịch vụ hosting bao gồm: uy tín và kinh nghiệm của nhà cung cấp, tính linh hoạt và khả năng mở rộng, chính sách bảo mật và sao lưu dữ liệu, thời gian phản hồi hỗ trợ kỹ thuật, và chi phí dịch vụ. Việc lựa chọn nhà cung cấp hosting phù hợp sẽ ảnh hưởng lớn đến sự hoạt động ổn định và hiệu suất của website. Website hosting là dịch vụ quan trọng không thể thiếu đối với việc [xây dựng và vận hành một website chuyên nghiệp](https://terusvn.com/thiet-ke-website-tai-hcm/). Nắm vững các kiến thức cơ bản về hosting sẽ giúp doanh nghiệp và cá nhân lựa chọn được gói dịch vụ phù hợp, từ đó nâng cao hiệu quả hoạt động của website. Tìm hiểu thêm về [Website Hosting Là Gì? Những Gì Bạn Cần Biết](https://terusvn.com/thiet-ke-website/website-hosting-la-gi/) Các dịch vụ tại Terus: Digital Marketing: · [Dịch vụ Facebook Ads](https://terusvn.com/digital-marketing/dich-vu-facebook-ads-tai-terus/) · [Dịch vụ Google Ads](https://terusvn.com/digital-marketing/dich-vu-quang-cao-google-tai-terus/) · [Dịch vụ SEO Tổng Thể](https://terusvn.com/seo/dich-vu-seo-tong-the-uy-tin-hieu-qua-tai-terus/) Thiết kế website: · [Dịch vụ Thiết kế website chuẩn Insight](https://terusvn.com/thiet-ke-website/dich-vu-thiet-ke-website-chuan-insight-chuyen-nghiep-uy-tin-tai-terus/) · [Dịch vụ Thiết kế website](https://terusvn.com/thiet-ke-website-tai-hcm/)

terus_technique

John von Neumann – The Man from the Future

Before I read The Man from the Future by Ananyo Bhattacharya, I only knew about John von Neumann in...

https://henrikwarne.com/2024/07/07/john-von-neumann-the-man-from-the-future/

learning, book, bookreview, history

--- title: John von Neumann – The Man from the Future published: true date: 2024-07-07 10:40:15 UTC tags: Learning,book,bookreview,history canonical_url: https://henrikwarne.com/2024/07/07/john-von-neumann-the-man-from-the-future/ --- Before I read [The Man from the Future](https://www.goodreads.com/book/show/61089520-the-man-from-the-future) by Ananyo Bhattacharya, I only knew about John von Neumann in two contexts: that computers use the _von Neumann architecture_, and that he appeared in a story about a mathematical problem I remember from many years ago. After reading it, I understand what a genius he was, and how much of science in the 20th century he influenced. He deserves to be better known than I think he is, and this is a great book to learn about him. [](https://henrikwarne.com/wp-content/uploads/2024/05/img_20240511_114134.jpg) The _von Neumann architecture_ means instructions and data are both stored in the same kind of memory, and instructions are fetched from memory and executed in order. This is taken for granted now, but this way of organizing computers was not a given when computers were invented. The story of the mathematical problem I remember is this: _Two trains are 60 kilometers apart, traveling towards each other on the same track. Each train is moving at a constant speed of 30 kilometers per hour. A fly starts at the front of one train and flies back and forth between the two trains at a constant speed of 60 kilometers per hour. The problem is to determine the total distance the fly travels before the trains collide and the fly is crushed between them._ One way to solve it is by summing the infinite series representing the fly’s back-and-forth trips. However, there is an easier way to solve it. Since each train is moving towards the other at 30 kilometers per hour, the combined speed at which the distance between them is closing is 60 kilometers per hour. Given that they are 60 kilometers apart, they will collide in 1 hour. Because the fly is flying at 60 kilometers per hour, and the trains will collide in 1 hour, the fly will travel a total distance of 60 kilometers. When this problem was posed to von Neumann, it didn’t take long for him to come up with the correct answer. The person who posed the problem was impressed by von Neumann’s quick response: “Ah, you came up with the short-cut for calculating the answer, instead of summing the series”. And von Neumann responded: “No, I summed the series in my head”. I read this story a long time ago. It is probably apocryphal, but I like the math problem, and I’ve always remembered the story. ## Early Years János Neumann was born in Budapest in 1903 into a Jewish family. In 1913, his father Max was awarded a hereditary title from the Austrian emperor Franz Joseph I. This is the origin of the _von_ in the name. When János moved to the United States, he anglicized his name, and became John von Neumann. His extraordinary mind for mathematics was apparent very early on, and he was only 17 when he published his first mathematical paper (on zeros of Chebyshev polynomials). In 1919, there was a communist coup in Hungary. The communist reign lasted only 133 days, but von Neumann would remember that chaotic period, and he remained a life-long anti-communist. ## Mathematical Upheaval At the beginning of the 20th century, there was a foundational crisis in mathematics. The roots of it came from discovering a flaw in Euclid’s _Elements_, the standard textbook on geometry for centuries. In it, there were five axioms believed to be self-evident. By building on those axioms in logical steps, more advanced results (like Pythagoras’ theorem) could be proved. This axiomatic method was the cornerstone of mathematics. In the 1830s, Euclid’s fifth postulate, the parallel postulate, was shown not to be true. It states that if two lines are drawn that intersect a third line so that the sum of the interior angles (a and b in the picture) is less than 180 degrees (two straight angles), then the lines must intersect at some point. On the other hand, if a and b do sum to 180 degrees, then they never meet (and are thus parallel). [](https://henrikwarne.com/wp-content/uploads/2024/05/fifth-postulate.jpg) The parallel postulate is true on flat surfaces, i.e. in Euclidean geometry, but it is not true in hyperbolic geometry, where the surface can curve, like a saddle. In the 1850s, Bernhard Riemann introduced spaces with any number of dimensions, hyperspace. By the end of the 19th century, many other theorems and proofs from Euclid’s geometry were being questioned. David Hilbert set out to rebuild geometry theory from scratch in a much more systematic and rigorous way. In 1899 he published his book _The Foundations of Geometry_. At that time, some scientists were of the opinion that some questions could not be answered. Hilbert was of the opposite opinion – “we can know and we will know”. Having successfully tackled geometry, he wanted to do the same for all of mathematics: make sure it was on a solid base of irrefutable axioms and theorems. However, this project ran into problems almost immediately. In 1901, the British philosopher Bertrand Russell struggled with a paradox in set theory. Some sets are straightforward, for example the set of possible cheesecakes. This set does not contain the set itself, because that set is not a literal cheesecake. Let’s call these kinds of sets **normal**. But when you consider the complement – the set of everything that isn’t cheesecake, then that set is a member of itself. Let’s call sets that are members of themselves **abnormal**. So far, so good. Now let’s form the set of all normal sets, and call it **R**. If R is normal, it should be contained in R, and thus be abnormal (because it would contain itself). On the other hand, if R is abnormal (i.e. it is a set that contains itself), it would not be contained in the set of all normal sets (itself), and therefore be normal. This is Russell’s paradox. This has the same structure as The Liar’s Paradox: “This sentence is false”. If the sentence is true, it is false, but if it is false, it is true. In both cases, the problem stems from the self-referential part of the paradox. Russell’s paradox threatened Hilbert’s project of get mathematics on more rigorous grounds. “If mathematical thinking is defective, where are we to find truth and certitude?” he asked. Von Neumann’s solution to the problem came out in a paper in 1925. In it, he lists, on one page, all the axioms needed to build up set theory. To avoid Russell’s paradox, he introduces sets and classes. A class is defined as a collection of sets that share a property. There is no “set of all sets that are not members of themselves”, but there is a “class of all sets that are not members of themselves”. This class is not a member of itself, because it is not a set (it’s a class). This development was to Hilbert’s liking. In 1928, he challenged mathematicians to prove that mathematics is **complete** , **consistent** and **decidable**. **Complete** meant that all mathematical theorems can be proved from a finite set of axioms. In other words, given some fixed set of axioms, is there a proof for every true statement? By **consistent** , Hilbert meant that the axioms would not lead to any contradictions. That is, can only the true statements be proved? And by **decidable** , he meant that there should be a step-by-step procedure (an algorithm) that, in finite time, can be used to show if a particular mathematical statement is true or false. This last property became known as the _Entscheidungsproblem_ (decision problem in German, since German was the language of science in those days). Within a decade, the answers were in: mathematics was neither complete nor consistent nor decidable! ## Quantum Mechanics At the same time, physics was going through its own crisis. In 1900, the German physicist Max Planck proposed that energy might be absorbed or emitted in discreet quantities, _quanta_. In 1905, Einstein theorized that light might be composed of a stream of particles, the first hint that quantum entities had both wave-like and particle-like properties. The Danish physicist Niels Bohr came up with a model of the atom, where electrons could only occupy special orbits, where the difference between the orbits equaled the difference in energy. To try to describe how atoms behaved, Werner Heisenberg came up with “matrix mechanics” in 1925. He wanted a theory that would explain experimental results. In experiments, scientists would “excite” atoms, by for example vaporizing a sliver of material in a flame, or by phasing a current through a gas. As a result, light was produces. There would be characteristic spectral lines (with given frequencies and intensities) for each element. Heisenberg proposed that the difference in the initial and final energy levels of the electrons accounted for the frequencies in the atomic emission lines. The possible transitions between levels could be represented in matrix form (with an infinitely large matrix). Since there could be different paths from the initial to the final levels (for example via intermediary levels), to get the probabilities of all possible transitions, he multiplied the individual transitions with their respective probabilities. At about the same time, Erwin Schrödinger came up with an entirely different way of describing atoms, as an infinite sum of superpositions of a wave function. Just like Heisenberg’s model, this worked well to describe how atoms behaved experimentally. But how could two wildly different models both describe reality so well? Could they be shown to be the same? This is exactly what von Neumann did, with some help from Hilbert. I won’t pretend to understand all the mathematics, but it relates to operators, eigenfunctions, Hilbert spaces, and square integrable functions. In the end, von Neumann was able to show that the coefficients of the expanded wave function were the elements that appear in the state matrix, in other words: they were fundamentally the same theory! ## Bombs In 1930, von Neumann moved to the United States, after receiving an offer to work at Princeton University (and later at the Institute for Advanced Study). The same year, the Nazis became the second largest party in Germany. When they came to power in 1933, Jews were forced out from all parts of society. University maths and physics departments were particularly hard hit, with some 15 – 18 percent dismissed. Twenty of the ousted researchers were former or future Nobel laureates. Many of the researchers (including virtually all of the founders of quantum mechanics) moved to the United States. Almost instantly, the balance shifted from Germany to the US in terms of quality of scientific output. Before the Nazis, almost all important physics and mathematics results were published in German. After the war, the United States was the dominant force. Von Neumann soon moved from Princeton to the Institute of Advanced Study. One of his achievements there was to prove the ergodic hypothesis. The hypothesis essentially bridges the gap between the microscopic behavior of individual particles in a system and the macroscopic properties observed in thermodynamics. In 1935, von Neumann became a father, when his daughter Marina was born. In 1936, Turing was visiting Princeton, and von Neumann read his paper “On Computable Numbers”. During the 1930s, von Neumann predicted there would be a war in Europe. In September 1941, before the United States entered the war, von Neumann wrote to his congressman: “The present war against Hitlerism is not a foreign war, since the principles for which it is being fought are common to all civilized mankind, and since even a compromise with Hitler would mean the greatest peril to the future of the United States.” To calculate artillery projectile trajectories, many variables need to be considered. For example, long range projectiles fly through progressively thinner air as they gain altitude, so experience less resistance to its motion. This, and a lot a of other factors, meant that hundreds of multiplications were needed to calculate a single trajectory. Calculating the shock waves of bombs also required advanced mathematics. Von Neumann had been involved in this research for a while when he became an official consultant for the Army in 1937. He then quickly became more and more involved, as he showed what he could do. One of his contributions was to show that the damage from a bomb is far greater if it is detonated in the air above the target, rather than on the ground. This is due to the destruction caused from the airburst. The general principle was know before, but he showed that the effect was much larger than previously thought. He also improved the accuracy of the calculations for the optimal altitude of a bomb’s detonation. In 1943, Robert Oppenheimer wrote to von Neuman, asking for help with the atom bomb project. At that time, there were two alternative ways of triggering the nuclear explosion: a gun-type design (a “bullet” of fissile material is fired into a target piece to start a nuclear chain reaction), and an implosion design (high explosives around a core is detonated to compress the core to trigger the nuclear reaction). For the implosion device to work, it was important that the core was compressed evenly from all sides. When von Neumann’s arrived at Los Alamos, the gun-type was the primary option. His main contribution was to come up with a design of wedge-shaped charges around the plutonium core, that would ensure the compression happened fast enough for the implosion device. This also meant that less plutonium would be needed for an equivalent yield, compared to the gun-type design, and the focus switched to the implosion design. ## Computers The calculations needed when developing the atom bomb were getting out of hand. Von Neuman knew that automatic calculating machines were being developed, and he became the chief advocate for using them at Los Alamos. He became aware of the ENIAC (Electronic Numerical Integrator and Computer) project after a chance meeting while waiting for a train in 1944. ENIAC was then more than a year away from being completed, but von Neumann immediately saw the usefulness of it. He was by then the second most famous scientist in the United States (after Einstein), and he had considerable influence in government and military circles. His first contribution was to ensure continued funding for the project. Not only did he have the necessary connections and influence, and saw the need for a computer to perform calculations. He was also perhaps the one person with the best understanding of the mathematical and logical underpinnings of the modern computer, since he was very familiar with both Gödel’s and Turing’s work. ### Gödel In 1931, Gödel showed that if arithmetic is consistent, then there are true statements in arithmetic that cannot be proved – i.e. arithmetic is incomplete. The proof uses a variation of the liar’s paradox. Consider the statement “_This statement is not provable_“. Let’s call this statement _Statement A_. Suppose Statement A could be proved. Then it would be false (since it asserts that it cannot be proved). That would mean a false statement could be proved (which would be inconsistent). On the other hand, if Statement A can _not_ be proved, then the statement is true (because it says that it is not provable). So then we have a true statement that cannot be proved. This means either arithmetic is inconsistent (which would make it useless, since false statements could be proved), or it is incomplete (i.e. it has true statements that can not be proved). So far, the above is just logic statements, not arithmetic. But Gödel cleverly expressed the above idea in arithmetic, using what is now called _Gödel numbers_. He came up with a system of numbering all axioms and theorems in _Principia Mathematica_. Furthermore, in his system, a certain operation would always correspond to the same arithmetic operation. For example, assume that the Gödel number of the statement “All swans are white” is 122. The negation of the statement is “Not all swans are white”, and might have the Gödel number of double that, i.e. 244. This property (the Gödel number doubles) would hold for _all_ negations, not just for this specific statement. Furthermore, each Gödel number can be unambiguously decoded back to its original expression. All logical operations in this system had corresponding arithmetical operations. A proof is a series of logical statements linked together. With Gödel’s system, he was able to turn the proofs into their equivalent arithmetic operations. So any proof can be checked by simple math. With this in place, he produced an arithmetic statement that mirrored the phrase “_This statement is not provable_“, and showed the result above using arithmetic. In other words, the language _of_ mathematics could be used to make meta-statements _about_ mathematics. By making arithmetics talk about arithmetics, Gödel dissolved the distinction between syntax and data. He also showed that numbers can represent logical operations, just like instructions in modern day computers. And the memory address of instructions are reminiscent of Gödel numbers. ### Turing Gödel showed in 1931 that Hilbert’s first two questions had negative answers. Five years later, Turing demonstrated that mathematics is not decidable. To do this, he invented an imaginary machine, which we now recognize as a computer, long before computers were invented. The Turing machine, as it is now called, is very simple. It consists of an infinite tape, with squares that can each contain a symbol, or be empty. The machine has a read/write head, that can read a symbol from the tape, erase it, and write a new symbol. The head can also move the tape one square to the left or the right. The head also has an _m-configuration_, which are the instructions on what to do, and its current state. For example, if reading a 0, erase it and write a 1, then move left. Today, we recognize the _m-configuration_ to be its program. Using this very simple machine, Turning built a set of instruction tables (i.e. subroutines, although he didn’t call them that) to search for and replace a symbol, to erase all symbols of particular kind, etc. Using these, he shows how to build a “universal computing machine”, itself a Turing machine, which is capable of simulating any other Turing machine. Given the other Turing machine’s _m-configuration_ (encoded as symbols on a tape), and that Turing machine’s input tape, the universal computing machine will output the same result as that other Turing machine. Armed with this universal Turing machine, Turing shows that the _Entscheidungsproblem_ is not possible to solve. To do so, he comes up with the halting problem. Assume that there is a Turing machine that can reliably answer whether another Turing machine will eventually halt on a given input. Call this H. Now create a new Turing machine, H’, that has H inside it. H’ will use H on its input, and if H answers “it will halt”, H’ goes into an infinite loop. On the other hand, if H answers “it will not halt”, H’ halts. Now run H’ with itself as the input. This lead to the logical impossibility of H’ both halting and not halting. Thus H’ can not exist, which mean H can not exist. In other words, it is not possible to have a general procedure for deciding if a mathematical statement is true or false. ### The von Neumann Architecture ENIAC became operational at the end of 1945. Instead of being used for artillery firing tables, it was used for solving partial differential equations for the hydrogen bomb project at Los Alamos. ENIAC’s program was fixed, but it could be reconfigured using patch cables (like in old telephone exchanges). But the scientists behind it were already working on a successor. In June 1945, von Neumann wrote the _First Draft of a Report on the EDVAC_. Whereas ENIAC was not easily reprogrammable, the new architecture described in the report was. This was the first instance of the modern design, where program and data are both stored in the same way in memory. This means it can easily be reprogrammed. Von Neumann was not the only one thinking about organizing a computer this way, but his clear description crystalized the thinking. His familiarity with both Gödel’s and Turing’s work was most likely helpful. The report was widely distributed, and helped keep this type of design in the public domain (open source), as opposed to being patented. This undoubtedly helped speed up the development and adoption of the design. ### Other Firsts Stanislaw Ulam, a friend and colleague of von Neumann, invented the **Monte Carlo** method of calculating probabilities using repeated simulations. While convalescing in hospital, he began to play solitaire to relieve the boredom. He started to try to calculate the probability to play out a hand to completion, but the calculation quickly became intractable. Then he realized he could get a good estimate simply by keeping track of the number of successful plays in 100 tries. And so Monte Carlo simulations were born. Von Neumann was quick to apply this new technique to simulate chain reactions for bomb calculations at Los Alamos. To run Monte Carlo simulations, you need a source of randomness. Von Neumann came up with a way of producing a sequence of **random numbers** he called “the method of middle-squares”. His method consisted of squaring an 8- or 10-digit binary number, then using the middle digits to become the next random number. This number in turn would be squared, and its middle digits became the next random number. Of course, this is not truly random, but it is good enough. Von Neumann later remarked “Anyone who considers arithmetical methods of producing random digits is, of course, in a state of sin”. Von Neumann and his colleague Herman Goldstine invented **flowcharts** to describe how the simulation programs worked. Von Neumann’s wife Klári worked as a programmer on the project. In a program in April 1948, Klári used a **subroutine** to generate random numbers by von Neumann’s “method of middle squares”. The invention of the subroutine is generally credited to computer scientist David Wheeler, but Klári’s code made use of one at least a year earlier. In 1955, von Neumann noted that computing capacity had nearly doubled every year since 1945, and he was of the opinion that this trend would continue. Noteworthy, since it predates **Moore’s law** by ten years. ## Game Theory Von Neumann also helped found the field of _Game Theory_. What does game theory mean? The game of chess is not a game in the game theory sense. As von Neumann explained, chess is a form of computation. In every situation, there is an optimal move. We may not be able to find what the optimal move is, but it exists. On the other hand, in a game-theoretic game, you must consider that the other player may bluff, and you have to consider how other players will react to your actions. It started in 1928, when von Neumann published the paper _On the Theory of Parlour Games_. In it he proves the _minimax_ theorem. There he considers a two-person game, where one person’s gain is the other person’s loss. For this he coined the term _ **zero-sum** _ game. The strategy is to minimize a player’s maximum loss. He proves that in every two-player zero-sum game, there is a strategy that guarantees the best outcome. In 1944, von Neumann and Oskar Morgenstern published the book _Theory of Games and Economic Behavior_, which became a bestseller, despite weighing in at a hefty 1200 pages. At the time of its writing, economists didn’t have a way to account for a persons preferences. Von Neumann came up with a system of a happiness/utility scale from 0 – 100, that could be used to account for them. The influence of utility theory and the notion of rational calculating individual introduced here spread wide and far. In the book von Neumann also analyzes the game of poker. He simplifies the analysis by assigning a score to each hand between 1 and 100. He also simplifies bids to just be either high or low. With these simplifications he is able to show the importance of bluffing. The purpose of bluffing is not so much to try to win with a bad hand, as it is to encourage the opponent to bet high with middle-range hands when you have a good hand. The book found applications in a lot of areas, for example on how to handle monopolies, and eventually helped in many fields, such as evolutionary biology. Another application became cold war planning, for example nuclear strategies, especially at the RAND (Research ANd Development) corporation in Santa Monica, California. RAND was started as a think tank for the US Army Air Forces. The subjects researched at RAND were completely alligned with von Neumann’s three obsessions at the time: computing, game theory and the bomb. One example of the research done at RAND is the duel, for example two aircraft about to shoot at each other. Each one wants to hold off fire until it is close enough to have a good chance of hitting the opponent. At the same time, it still wants to fire first. This is a good example of a two-player zero-sum game. Another problem worked on at RAND was that of nuclear war. I was surprised to learn that right after World War II, there were many advocates of a pre-emptive nuclear strike against the Soviet Union. ## Self-Replication As if he wasn’t busy enough with all his various projects, von Neumann also took an interest in comparing biological machines to synthetic ones. This resulted in the book _Theory of Self-Reproducing Automata_. He was thinking about whether a machine could be constructed that could create a copy of itself. To those who doubted it is possible, we replied that organisms in nature reproduce themselves all the time. Von Neumann used the universal Turing machine as his starting point. It can imitate any other Turing machine if it is given its instructions and input. What would it take for it to instead copy itself? Von Neumann’s answer is that three things are needed. First, it needs a set of instructions on how to build a new machine. Second, the machine needs a construction unit that can build the new machine by following the instructions. Finally, the machine needs a unit that can copy the instructions and insert them into the new machine. It is interesting to note that five years before the discovery of the structure of DNA in 1953, and before scientists had a good understanding of cell replication in detail, von Neumann identified the key steps of what it needed for an entity to replicate itself. After a while, von Neumann wondered if three dimensions were necessary, or if self-replication was possible in two dimensions. After getting inspiration from Stanislaw Ulam, he developed what would be known as his **cellular model of automata**. His self-reproducing automata lives on an endless two-dimensional grid, consisting of squares, or _cells_. Each cell can be in one of twenty-nine different states. Further, each cell can only communicate wih its four contiguous neighbors. There are many rules on how cells can communicate, and how this is done. Most cells start in a dormant state, but can be brought to “life” by neighboring cells, and can later also be “killed”. Using this setup, he then builds units that perform the three tasks he identified as necessary for self-reproduction. He constructs a tape consisting of dormant cells (representing 0) and live cells (representing 1). Adding a control unit that can read from and write to tape cells, he is able to reproduce a universal Turing machine in two dimensions. He then designs a constructing arm that can snake out to any cell, set it to the right state, then withdraw. The design took a lot longer than he expected, and other pressing government tasks meant that he was never able to finish his design. After von Neumann’s death in 1957, Arthur Burks, who had worked with him on the ENIAC, completed the automaton by going through von Neumann’s notes. The complete machine fits in an 80×400-cell box, but has an enormous tail, 150,000 squares long, containing the instructions needed to clone itself. Start the clock, and step by step the behemoth starts work, reading and executing each tape instruction to create a copy of itself some distance away. The construction arm grows until it reaches a predefined point in the matrix, then it starts depositing row upon row of cells to create its offspring. The first attempts to actually run his design on a computer was in 1994, but then it took impossibly long. On a modern laptop though, it takes minutes to run. The most famous example of a cellular automaton was developed in 1970 – **Conway’s Game of Life**. ## Another Story A few weeks after I finished reading the book, I came across this quote. The book has many great stories about von Neumann, but not this one. But I think it fits to include this one as well: “There was a seminar for advanced students in Zürich that I was teaching and von Neumann was in the class. I came to a certain theorem, and I said it is not proved and it may be difficult. Von Neumann didn’t say anything but after five minutes he raised his hand. When I called on him, he went to the blackboard and proceeded to write down the proof. After that I was afraid of von Neumann.” ― **George Pólya** ## Conclusion Von Neumann is such a fascinating character. He was involved in so many important scientific projects and break-throughs that it truly boggles my mind. I particularly liked to read about the birth of the modern computer, and his influence on that. I also really enjoyed learning about the background and theoretical underpinnings from Gödel’s and Turing’s work. The book is very well written, and full of interesting anecdotes. In addition to all the math, science and technology, there is also a good bit of history of the first half of the 20th century. Highly recommended if you are interested in the history of computing and science in general!

henrikwarne

Thiết Kế Website Xuất Khẩu Lao Động Chuyên Nghiệp, Uy Tín

Những chức năng cốt lõi của một website xuất khẩu lao động: Trang chủ: Giới thiệu tổng quan về công...

https://dev.to/terus_technique/thiet-ke-website-xuat-khau-lao-dong-chuyen-nghiep-uy-tin-7g8

website, digitalmarketing, seo, terus

 Những chức năng cốt lõi của một website xuất khẩu lao động: Trang chủ: Giới thiệu tổng quan về công ty và dịch vụ xuất khẩu lao động. Giới thiệu: Cung cấp thông tin chi tiết về lịch sử, đội ngũ, và năng lực của công ty. Module xuất khẩu lao động: Cho phép người dùng tìm hiểu các cơ hội việc làm ở nước ngoài, nộp hồ sơ ứng tuyển, và theo dõi quá trình xử lý hồ sơ. Module đào tạo và định hướng: Cung cấp thông tin về các khóa học, chương trình đào tạo và định hướng nghề nghiệp cho lao động xuất khẩu. Module Tin tức: Cập nhật các tin tức, chính sách mới về xuất khẩu lao động. Tư vấn trực tuyến: Cho phép người dùng được tư vấn trực tiếp về các dịch vụ của công ty. Tìm kiếm: Giúp người dùng tìm kiếm thông tin, cơ hội việc làm một cách dễ dàng. Liên hệ: Cung cấp thông tin liên hệ và cho phép người dùng gửi yêu cầu, phản hồi. Ngoài ra, website cần được tối ưu để đáp ứng các tiêu chuẩn về tốc độ tải, giao diện người dùng, tính di động, và bảo mật. Lý do nên sử dụng [dịch vụ thiết kế website xuất khẩu lao động](https://terusvn.com/thiet-ke-website-tai-hcm/): Tăng tính chuyên nghiệp, độ tin cậy của công ty trong mắt người lao động. Cung cấp thông tin đầy đủ và tiện lợi cho người lao động tìm kiếm cơ hội việc làm. Tăng khả năng tiếp cận và thu hút người lao động tiềm năng. Nâng cao hiệu quả quản lý, vận hành dịch vụ xuất khẩu lao động. Những yêu cầu khi thiết kế website xuất khẩu lao động: Giao diện người dùng chuyên nghiệp, đơn giản. Thông tin đầy đủ, chính xác và dễ hiểu. Tối ưu hóa SEO để nâng cao khả năng hiển thị trên các công cụ tìm kiếm. Tốc độ tải trang nhanh. Tối ưu hóa cho mọi thiết bị (responsive design). Đảm bảo an ninh, bảo mật cao. Nói chung, một [website xuất khẩu lao động chất lượng](https://terusvn.com/thiet-ke-website-tai-hcm/) cần đáp ứng đầy đủ các chức năng cốt lõi, với giao diện chuyên nghiệp, thông tin đầy đủ, tối ưu hóa về kỹ thuật và bảo mật. Điều này sẽ giúp doanh nghiệp nâng cao năng lực cạnh tranh, thu hút và phục vụ người lao động hiệu quả hơn. Tìm hiểu thêm về [Thiết Kế Website Xuất Khẩu Lao Động Chuyên Nghiệp, Uy Tín](https://terusvn.com/thiet-ke-website/thiet-ke-website-xuat-khau-lao-dong/) Các dịch vụ tại Terus: Digital Marketing: · [Dịch vụ Facebook Ads](https://terusvn.com/digital-marketing/dich-vu-facebook-ads-tai-terus/) · [Dịch vụ Google Ads](https://terusvn.com/digital-marketing/dich-vu-quang-cao-google-tai-terus/) · [Dịch vụ SEO Tổng Thể](https://terusvn.com/seo/dich-vu-seo-tong-the-uy-tin-hieu-qua-tai-terus/) Thiết kế website: · [Dịch vụ Thiết kế website chuẩn Insight](https://terusvn.com/thiet-ke-website/dich-vu-thiet-ke-website-chuan-insight-chuyen-nghiep-uy-tin-tai-terus/) · [Dịch vụ Thiết kế website](https://terusvn.com/thiet-ke-website-tai-hcm/)

terus_technique

Combining calendars

One of the most popular posts I’ve written in recent months was the one where I talked about all the...

https://perlhacks.com/2024/07/combining-calendars/

cpan, calendar, ical, mergcal

--- title: Combining calendars published: true date: 2024-07-07 10:35:45 UTC tags: cpan,calendar,ical,mergcal canonical_url: https://perlhacks.com/2024/07/combining-calendars/ cover_image: https://dev-to-uploads.s3.amazonaws.com/uploads/articles/wzyiafpbpcrq2sm8451z.png --- One of the most popular posts I’ve written in recent months was the one where I talked about [all the pointless personal projects](https://dev.to/davorg/pointless-personal-side-projects-1jlk) I have. The consensus in the many comments I received was that anything you find useful isn’t pointless. And I can’t really argue with that. But it’s nice when one of your projects is used by other people. And that happened to me recently. The initial commit in [mergecal](https://github.com/davorg/mergecal) is from 2016, but I strongly suspect it existed as code that wasn’t in source code control for several years before that. The idea behind it is simple enough. I wanted to be able to share my calendar with someone, but I didn’t have a single iCal file that I could share. For various complicated and yet dull reasons, my calendar is split across a number of separate iCal files. Initially, I remember thinking there must be an online service that will take a list of iCal calendars and produce a single, combined one. But a few hours on Google didn’t find anything so I did what any hacker would do and wrote my own. It really wasn’t difficult. As usual, it was just a case of plumbing together a few CPAN modules. In this case, [Text::vFile::asData](https://metacpan.org/pod/Text::vFile::asData) did most of the heavy lifting – with [JSON](https://metacpan.org/pod/JSON) used to parse a configuration file. It can’t have taken more than an hour to write. And, as the [commit history](https://github.com/davorg/mergecal/commits/master/) shows, very few subsequent changes were required. I just set it up with the correct configuration and a cronjob that rebuilt the combined calendar once a day and published it on my web site. And then I forgot about it for years. The best kind of software. Then, in January of this year, I got a [pull request](https://github.com/davorg/mergecal/pull/1) against the code. This astonished me. MY SOFTWARE HAD A USER. And in the PR, the user said “It boggles my mind that there is still no simpler free solution, even after all those years”. So maybe this would be useful to a few more people. Perhaps I should market it better (where “better” means “at all”). As a first step towards that, I’ve rewritten it and released it to CPAN as [App::MergeCal](https://metacpan.org/pod/App::MergeCal). Maybe I should think about putting it online as some kind of web service. Anyway, it makes me incredibly happy to know my software is used by even one person. Which reminds me – please take the time to say “thank you” to anyone whose software you find useful. It’s a small thing, but you’ll make someone very happy. The post [Combining calendars](https://perlhacks.com/2024/07/combining-calendars/) first appeared on [Perl Hacks](https://perlhacks.com).

davorg

Google Ads For Medical Billing Company

Google Ads For Medical Billing Companies can be transformative tools for expanding their client base...

https://dev.to/isha_sharma_c81f86d34a39c/google-ads-for-medical-billing-company-1nic

Google Ads For Medical Billing Companies can be transformative tools for expanding their client base and visibility, today medical billing companies are in high demand. So starting a medical billing company could be a smart business move. Google ads are an effective tool that can significantly enhance your online visibility and achieve more growth in business by partnering with various agencies while partnering with Pal digital marketing. It is the finest Google ads agency for medical billing companies.<a href="[URL](https://sites.google.com/view/gogle-ads-for-medical-billing/home)">gogle ads for medical billing company</a>

isha_sharma_c81f86d34a39c

Thiết Kế Website Tại Quảng Ngãi Thu Hút, Đẹp Mắt

Quảng Ngãi là một tỉnh miền Trung của Việt Nam, với nhiều tiềm năng phát triển kinh tế và doanh...

https://dev.to/terus_technique/thiet-ke-website-tai-quang-ngai-thu-hut-dep-mat-i7j

website, digitalmarketing, seo, terus

 Quảng Ngãi là một tỉnh miền Trung của Việt Nam, với nhiều tiềm năng phát triển kinh tế và doanh nghiệp. Tuy nhiên, trong bối cảnh số hóa hiện nay, việc sở hữu một website chuyên nghiệp trở nên vô cùng quan trọng để doanh nghiệp có thể cạnh tranh và phát triển bền vững. Một [website chuyên nghiệp](https://terusvn.com/thiet-ke-website-tai-hcm/) cần có những tính năng cơ bản như trang chủ, giới thiệu, sản phẩm/dịch vụ, tin tức, liên hệ... Ngoài ra, website cần được thiết kế với giao diện hiện đại, hình ảnh chất lượng, kết hợp hài hòa giữa thông tin và trải nghiệm người dùng. Đây là những yếu tố quan trọng để tạo ấn tượng tốt đầu tiên, thu hút và giữ chân khách hàng. Terus có nhiều năm kinh nghiệm trong lĩnh vực thiết kế website tại Quảng Ngãi, với danh sách khách hàng là các doanh nghiệp trong nhiều lĩnh vực như bán lẻ, dịch vụ, sản xuất... Các dự án website mà Terus thực hiện đều được thiết kế chuyên nghiệp, đáp ứng nhu cầu kinh doanh cụ thể của từng khách hàng. Ngoài thiết kế website, Terus còn cung cấp các dịch vụ bổ sung như xây dựng thương hiệu, quản trị nội dung, SEO, quảng cáo... giúp website của khách hàng hoạt động hiệu quả và đạt được mục tiêu kinh doanh. Đội ngũ chăm sóc khách hàng tại Terus cũng sẽ hỗ trợ khách hàng trong suốt quá trình vận hành website lâu dài. [Dịch vụ thiết kế website của Terus](https://terusvn.com/thiet-ke-website-tai-hcm/) tại Quảng Ngãi cam kết mang lại cho khách hàng những giải pháp website chuyên nghiệp, đáp ứng đầy đủ nhu cầu kinh doanh. Với kinh nghiệm phong phú, quy trình làm việc bài bản và đội ngũ chuyên gia, Terus sẽ là đối tác tin cậy giúp doanh nghiệp tại Quảng Ngãi khẳng định thương hiệu và tăng hiệu quả kinh doanh trên môi trường online. Tìm hiểu thêm về [Thiết Kế Website Tại Quảng Ngãi Thu Hút, Đẹp Mắt](https://terusvn.com/thiet-ke-website/terus-thiet-ke-website-tai-quang-ngai/) Các dịch vụ tại Terus: Digital Marketing: · [Dịch vụ Facebook Ads](https://terusvn.com/digital-marketing/dich-vu-facebook-ads-tai-terus/) · [Dịch vụ Google Ads](https://terusvn.com/digital-marketing/dich-vu-quang-cao-google-tai-terus/) · [Dịch vụ SEO Tổng Thể](https://terusvn.com/seo/dich-vu-seo-tong-the-uy-tin-hieu-qua-tai-terus/) Thiết kế website: · [Dịch vụ Thiết kế website chuẩn Insight](https://terusvn.com/thiet-ke-website/dich-vu-thiet-ke-website-chuan-insight-chuyen-nghiep-uy-tin-tai-terus/) · [Dịch vụ Thiết kế website](https://terusvn.com/thiet-ke-website-tai-hcm/)

terus_technique

Modern Software Architecture is a Joke

QL is the most misunderstood language in computer history. By far. It’s the HIGHER-level language,...

https://dev.to/vbilopav/modern-software-architecture-is-a-joke-23d9

sql, architecture

QL is the most misunderstood language in computer history. By far. It’s the HIGHER-level language, meaning the higher-level generation than today’s common languages. As such, it aims to provide an abstraction for your hardware, memory, disks, operating system, and everything. Including algorithms to a certain point. Have you heard about execution plans? Well, that’s just the engine selecting the most appropriate algorithm for your declared intention with data, so you don’t have to write it yourself. And, it is also a domain-specific language where that specific domain is just, literally, data itself. On the other hand, the domain of your non-domain-specific everyday common languages such as JavaScript, Java, or CSharp is, of course, the operating system, disks, memory, devices, and hardware, and you typically use it to write algorithms and use devices. That is why SQL is a higher language with a higher level of abstraction. When I create some data with SQL, I have no idea where it is physically; that is not even the point, and I don’t care. All I need is to declare my intent and engine is suppose to find the most appropriate algorithm for me. So, if you remove all these things for the equation: disks, memory, files, locks, threads, processes, etc, you have none of that; none of that exists anymore. Besides data, what else is left? That’s right, your business logic. Not once in my 25 years of writing SQL have I been concerned with storage concerns. Not once. I have written SQL every day, all day, for decades now. That is because, as I said, devices are abstracted and hidden, which isnot your concern. Now, read how the grandfather of the entire modern software architecture calls databases just an IO device. Quote: > The database is merely an IO device. … > Blessed is the team whose architects have so isolated them from slow and resource hungry IO devices … [A Little Architecture](https://blog.cleancoder.com/uncle-bob/2016/01/04/ALittleArchitecture.html)

vbilopav

Thiết Kế Website Bán Giày Chuyên Nghiệp

Kinh doanh bán lẻ giày dép đang đối mặt với nhiều thách thức trong thời đại số hóa. Doanh số tại các...

https://dev.to/terus_technique/thiet-ke-website-ban-giay-chuyen-nghiep-2bjl

website, digitalmarketing, seo, terus

 Kinh doanh bán lẻ giày dép đang đối mặt với nhiều thách thức trong thời đại số hóa. Doanh số tại các cửa hàng truyền thống đang giảm sút, trong khi các trang thương mại điện tử và chi phí quảng cáo lại ngày càng lớn. Để vượt qua những khó khăn này, việc xây dựng một website bán hàng chuyên nghiệp, đầy đủ chức năng trở nên vô cùng quan trọng. Một website bán giày hiện đại cần có giao diện thời trang, phong cách riêng, kết hợp hài hòa giữa hình ảnh, thông tin sản phẩm và chính sách của cửa hàng. Khách hàng cần được cung cấp đầy đủ thông tin về sản phẩm, chính sách bán hàng và các đánh giá từ người dùng. Website cũng cần có các tính năng cơ bản như trang chủ, trang giới thiệu, trang sản phẩm/dịch vụ, giỏ hàng, trang tin tức và trang liên hệ. Việc sở hữu một website bán hàng mang lại nhiều lợi ích cho các cửa hàng giày dép. Thứ nhất, nó giúp khẳng định thương hiệu và tăng độ nhận diện của cửa hàng trên môi trường digital. Thứ hai, nó có thể tăng hiệu quả bán hàng bằng cách tạo ra một kênh bán hàng trực tuyến riêng. Cuối cùng, website cũng giúp cửa hàng tự chủ hơn trong việc kinh doanh, thay vì phụ thuộc quá nhiều vào các sàn thương mại điện tử. Terus đã có nhiều năm kinh nghiệm trong lĩnh vực [thiết kế website bán hàng](https://terusvn.com/thiet-ke-website-tai-hcm/), đặc biệt là trong ngành giày dép. Họ có thể chia sẻ các ví dụ cụ thể về những website bán giày mà họ đã thiết kế thành công trước đây. Khách hàng có thể dễ dàng bắt đầu với dịch vụ thiết kế website của Terus bằng cách liên hệ trực tiếp qua email hoặc các kênh khác. Việc xây dựng một [website bán hàng chuyên nghiệp, đầy đủ chức năng](https://terusvn.com/thiet-ke-website-tai-hcm/) là giải pháp hiệu quả để các cửa hàng giày dép vượt qua những thách thức của thời đại số hóa. Dịch vụ thiết kế website của Terus cam kết mang lại giá trị gia tăng cho khách hàng, từ khảo sát nhu cầu đến vận hành lâu dài. Với kinh nghiệm và chuyên môn trong lĩnh vực này, Terus sẽ là đối tác tin cậy để giúp các cửa hàng giày dép khẳng định thương hiệu và tăng hiệu quả bán hàng trên môi trường trực tuyến. Tìm hiểu thêm về [Thiết Kế Website Bán Giày Chuyên Nghiệp](https://terusvn.com/thiet-ke-website/terus-thiet-ke-website-ban-giay/) Các dịch vụ tại Terus: Digital Marketing: · [Dịch vụ Facebook Ads](https://terusvn.com/digital-marketing/dich-vu-facebook-ads-tai-terus/) · [Dịch vụ Google Ads](https://terusvn.com/digital-marketing/dich-vu-quang-cao-google-tai-terus/) · [Dịch vụ SEO Tổng Thể](https://terusvn.com/seo/dich-vu-seo-tong-the-uy-tin-hieu-qua-tai-terus/) Thiết kế website: · [Dịch vụ Thiết kế website chuẩn Insight](https://terusvn.com/thiet-ke-website/dich-vu-thiet-ke-website-chuan-insight-chuyen-nghiep-uy-tin-tai-terus/) · [Dịch vụ Thiết kế website](https://terusvn.com/thiet-ke-website-tai-hcm/)

terus_technique

Mastering JavaScript, Python, and Java: The Path to Becoming a Successful Software Developer in 2024

In today’s fast-paced world, software development is one of the most in-demand and rapidly growing...

https://dev.to/myexamcloud/mastering-javascript-python-and-java-the-path-to-becoming-a-successful-software-developer-in-2024-55po

java, javascript, python, programming

In today’s fast-paced world, software development is one of the most in-demand and rapidly growing industries. As a result, there’s an increasing demand for skilled software developers. But what does it take to become a successful software developer in 2024? In this article, we’ll explore how freshers can pave their way to become successful software developers by mastering three essential languages: JavaScript, Python, and Java. **JavaScript (5.8 million users)** JavaScript, introduced in 1995, quickly gained popularity as the go-to language for front-end web development. Its seamless integration with HTML allows for interactive and dynamic features on websites, making it an essential skill for any modern web application. Companies like Google, Facebook, and YouTube rely heavily on JavaScript for their design and functionality, making it a highly sought-after skill in the market. For freshers interested in web development, becoming a JavaScript developer is an excellent career choice. With over 13.8 million job opportunities worldwide, it offers a lucrative job market. So, how can you become a successful JavaScript developer in 2024? Here are some steps you can follow: **1. Start with the basics:** Begin by learning the fundamentals of JavaScript, such as syntax, data types, control structures, and functions. You can find numerous online tutorials, books, and coding bootcamps to help you get started. **2. Familiarize yourself with client-side frameworks and libraries:** As a JavaScript developer, you should be familiar with popular client-side frameworks and libraries like ReactJS, Node JS, TypeScript, and jQuery. **3. Understand asynchronous programming:** JavaScript heavily depends on asynchronous programming, so it’s crucial to have a strong grasp on how to handle asynchronous events and callbacks. **4. Learn functional programming:** Functional programming is a key concept in JavaScript, so make sure to have a good understanding of its principles and applications in your code. **5. Write cross-browser compatible code:** Since JavaScript is used in various web browsers, it’s crucial to know how to write code that works seamlessly across different browsers. **6. Practice, practice, practice:** The best way to improve your skills is to practice writing code. Build simple projects, participate in coding communities, and contribute to open-source projects to sharpen your skills. **7. Develop strong communication skills:** As a JavaScript developer, you’ll often work in a team, so having strong communication skills is essential for effective collaboration. **8. Stay updated with the latest technology:** Technology is constantly evolving, and it’s crucial for JavaScript developers to stay updated with the latest trends, updates, and tools in the industry. **9. Master efficient memory management:** JavaScript has automated garbage collection, but having a good understanding of memory management can optimize your code and prevent performance issues. By following these steps and continuously learning and improving your skills, you can become a successful JavaScript developer and secure a promising career in the constantly evolving field of web development. **Python (5.2 million users)** Despite being the oldest of the three languages, Python’s popularity continues to soar since its debut in 1991. Known as a scripting language, [Python](https://www.myexamcloud.com/onlineexam/python-certification-practice-tests.courses) excels in tasks such as data analysis, automation, and querying. It’s heavily used in industries like big data and analytics and powers popular platforms like Amazon, Netflix, and Spotify. As a fresher, mastering Python can open doors to a wide range of job opportunities. To become a Python developer in 2024, you need to have a strong understanding of the language and its various applications. Here’s how you can achieve that: **1. Build a strong portfolio:** Start by building a robust portfolio of projects that showcase your Python skills. This can include personal projects, contributions to open-source projects, and any other relevant coding experience. **2. Continuously improve your code:** Write clean and readable code following standard conventions and best practices. This not only showcases your expertise to potential employers but also enables you to collaborate effectively with other developers. **3. Practice, practice, practice:** The more you code in Python, the better you’ll become. Challenge yourself with new projects and seek out opportunities to learn and improve your skills. **4. Read and contribute to open-source projects:** Contributing to open-source projects not only expands your knowledge but also shows potential employers your ability to work in a team and add value to existing projects. **5. Stay updated with new technologies:** As a Python developer, it’s crucial to stay updated with new tools, libraries, and frameworks relevant to your work. This will help you adapt to new projects and stay competitive in the industry. **6. Master popular libraries:** Python is a top programming language for machine learning and AI, and there are numerous libraries available to help with these tasks. It’s essential to be familiar with libraries like NumPy, SciPy, Theano, Pandas, TensorFlow, Keras, PyTorch, Scikit-Learn, Matplotlib, and Plotly. **7. Network with other developers:** Attend tech events, join online communities, and network with other developers to stay updated with current trends, gain insights from experienced professionals, and potentially find job opportunities. By following these steps and continuously learning, you can become a successful Python developer and contribute to the rapidly evolving world of software development in 2024. **Java (3.2 million users)** Java serves as the backbone of most enterprise applications, providing the underlying architecture for crucial tasks like authentication and storage. It’s known for its reliability and scalability, making it a top choice for developing large-scale applications. As a fresher, learning [Java](https://www.myexamcloud.com/onlineexam/javacertification.courses) will give you a solid understanding of programming basics and lay the foundation for a successful career in software development. If you want to become a Java developer in 2024, here are some steps to follow: **1. Master the fundamentals:** Start by learning the core Java SE language and its concepts like loops, arrays, and operators. Familiarize yourself with key APIs like java.lang and java.io. It’s also crucial to have a strong grasp of object-oriented programming (OOP) principles. **2. Practice, practice, practice:** Regularly practicing coding will improve your skills. Get comfortable with the syntax and familiarize yourself with coding conventions. Aim to solve coding challenges and take up mini-projects to apply your knowledge and improve your problem-solving skills. **3. Learn Java EE:** Once you have a strong foundation in Java SE, move on to Java EE (Enterprise Edition) to learn web development. You’ll explore technologies like Servlet, WebSocket, and Java Server Faces, which are essential for creating web applications. **4. Build projects with Servlets and JSP:** As you learn web development, put your knowledge into practice by creating mini-projects. Experiment with combining Java EE with front-end technologies like HTML, CSS, and JavaScript. Make sure to use both Servlets and JSP to evaluate your understanding of these concepts. **5. Familiarize yourself with Java frameworks:** To stay relevant in the job market, learn popular Java frameworks like Hibernate and Spring. These frameworks are heavily used in industries like web development and data analysis and can make you a valuable asset for companies seeking skilled Java developers. **6. Explore Java frameworks for AI development:** With the growing trend of artificial intelligence, it’s beneficial for Java developers to learn AI frameworks built with Java. Some popular options include D3web, Eye-Opening, Tweety, OptaPlanner, and Neuroph. These frameworks use algorithms and data structures to solve complex optimization and decision-making problems in industries like logistics, healthcare, and finance. Knowledge of these frameworks can give you an edge in the job market and open doors to exciting opportunities in AI. Becoming a successful software developer in 2024 requires dedication and continuous learning. Stay updated with the latest developments in these languages and consistently build and improve your project portfolio, demonstrating your expertise to potential employers. With constant evolution and new advancements in technology, it’s an exciting time for those aspiring to become software developers. By mastering JavaScript, Python, and Java, you can pave your way to a prosperous career in software development.

myexamcloud

Wk 4: Deployment - MLOPs with DataTalks

Oh, you made it to the 4th week! Nice! Here, we see how to handle Deployment of our derived models,...

https://dev.to/afrologicinsect/wk-4-deployment-mlops-with-datatalks-ei2

programming, intermediate, machinelearning, python

Oh, you made it to the 4th week! Nice! Here, we see how to handle Deployment of our derived models, there are two major options for deployment - Stream or Batch Prediction services. <More?> However, let's focus on how to get the [assignment](https://github.com/DataTalksClub/mlops-zoomcamp/blob/main/cohorts/2024/04-deployment/homework.md) done with. **Q1: Standard deviation - Predicted duration for March 2023** We already have the notebook we used in [Wk 1](https://github.com/DataTalksClub/mlops-zoomcamp/tree/main/cohorts/2024/04-deployment/homework) to achieve something like this we are just making adjustments - mainly to acquire the 2023 dataset. ###### 1.1 Create your Wk4 Directory and setup your environment ###### 1.2 Fetch the items in the link above, leave the items in the same directory You would make a few changes in the _starter.ipynb_ file  make it: ``` ## Load Mar Data'23 df = read_data("https://d37ci6vzurychx.cloudfront.net/trip-data/yellow_tripdata_2023-03.parquet") ``` to fetch 2023 records, in the next chunk, run: ``` ## Isolating stated catgeories, call dict vectorizer and predict dicts = df[categorical].to_dict(orient='records') X_val = dv.transform(dicts) y_pred = model.predict(X_val) print(f"Q1. Standard Deviation of predictions: {round(y_pred.std(), 3)}") ``` **Q2: Preparing the output** ###### 2.1: Create an artificial **ride_id** column: Simply create the _year_ and _month_ variable to set the *ride_id* ``` ## Ride ID Column year = 2023 month = 3 df["ride_id"] = f"{year:04d}/{month:02d}_" + df.index.astype("str") ``` Now, we can add the *ride_id* to the predictions with the following chunk: ``` ## Save predictions to dataframe df_results = pd.DataFrame(columns = ["predictions", "ride_id"]) df_results["predictions"] = y_pred df_results["ride_id"] = df["ride_id"] ``` View the head of the result with `df_results.head()` it should look like:  ###### 2.2 Save the results with: ``` ## Path to output file import os from datetime import date output_pth = "../output_files" if not os.path.exists(output_pth): os.makedirs(output_pth) output_file = output_pth + "/results_" + str(date.today()) + ".parquet" df_results.to_parquet( output_file, engine = 'pyarrow', compression = None, index = False ) # Size of the output file ``` We could have easily visit the explorer folder to check the file size, but let's learn a little bash - run the following to retrieve the file sizes in the folder: `! ls -lh ../output_files/* | awk '{print $5, $9}'` **Remember** the exclamation(!) prefix is because you are in the jupyter notebook, you wouldn't need it if you were running this from the terminal. -lh: The -l flag displays detailed information about each file (including permissions, owner, size, modification date, etc.), and the -h flag makes the file sizes human-readable (e.g., KB, MB, GB) The result should look like: --> **65M ../output_files/results_2024-06-08.parquet** i.e 65 We are on track to automation. **Q3. Creating the scoring script** Just run: ``` !jupyter nbconvert --to script starter.ipynb ``` - starter.ipynb: is the name of your notebook. **Q4 Pipenv** Here, you have to `pip install pipenv pipenv --python 3.x` (put the appropriate python version in) `pipenv install <package>==<package.version>` to then install the necessary packages like _os_, _sklearn_, etc Once this is done, indeed your **Pipfile** and **Pipfile.lock** files appear.  **Q5: Parametrize the script** Parametrize here means that we use/set system variable that can accept values, like the _year_, _month_, we initially set, such that our script can now run on its own from the terminal. **Automation**. ###### 5.1 Retrieve derived script See how this is done in the derived _[script.py](https://github.com/AkanimohOD19A/MLOps_24/blob/main/wk4/notebooks/script.py)_ script, particularly this is set for taxi-type, year and month like so: ###### 5.2 Set Parameters ``` taxi_type = sys.argv[1] #yellow year = int(sys.argv[2]) #2024 month = int(sys.argv[3]) #3 ``` after you have the script, run the following in the terminal: `python starter.py yellow 2023 4` - a print statement would handle the mean predicted duration for April 2023. You should have: ``` (MLOps_24) C:\Users\..\MLOps_24\wk4\notebooks>python starter.py yellow 2023 4 reading the data from https://d37ci6vzurychx.cloudfront.net/trip-data/yellow_tripdata_2023-04.parquet... loading the model with RUN_ID=../models/model.bin... applying the model... Q5. Mean of predictions: 14.292 saving the result to ../output_files/yellow/2023-04.parquet... ``` **Q6. Docker container** ###### 6.1 What are Docker Containers? [ChatGPT] A Docker container is a lightweight, **standalone**, and executable package of software that includes everything needed to run an application. It packages up code and all its dependencies, so the application runs quickly and reliably from one computing environment to another. _Speed and Independence_ - it means we can container the requirements for the desired output and run our applications anywhere... You don't have to understand it all, right now - let's go. ###### 6.2 Create Docker and Launch Docker Engine: In the same directory as we have been working all along; We simply create a _Dockerfile_, launch our Docker Engine locally and create a _requirements.txt_ that has a list and versions of our packages. Update the _Dockerfile_ like you so: ``` # Use the base image with the model and vectorizer FROM agrigorev/zoomcamp-model:mlops-2024-3.10.13-slim # Set work directory WORKDIR /app # Copy your script into the container COPY script.py . # If you have any dependencies in a requirements.txt file, copy that in as well COPY requirements.txt . # Install any required packages RUN pip install --no-cache-dir -r requirements.txt # Run script CMD [ "python", "script.py", "yellow", "2023", "5" ] ``` ###### 6.2.1 Base Image Selection: > FROM agrigorev/zoomcamp-model:mlops-2024-3.10.13-slim : This line specifies the base image for our Docker container. It uses the image tagged as `mlops-2024-3.10.13-slim` from the `agrigorev/zoomcamp-model` repository. 6.2.2 Setting the Working Directory: `WORKDIR /app`: This line sets the working directory inside the container to `/app`. Any subsequent commands will be executed relative to this directory. ###### 6.2.3 Copying Files into the Container: `COPY script.py .`: This command copies the _script.py_ file from your local machine (the host) into the `/app` directory within the container. `COPY requirements.txt .`: Similarly, it copies the requirements.txt file (if it exists) into the same directory. ###### 6.2.4 Installing Dependencies: `RUN pip install --no-cache-dir -r requirements.txt`: This line installs Python packages listed in requirements.txt using pip. The `--no-cache-dir` flag prevents caching of downloaded packages. ###### 6.2.5 Running the Script: `CMD [ "python", "script.py", "yellow", "2023", "5" ]`: The _CMD_ instruction specifies the default command to run when the container starts. In this case, it runs the _script.py_ Python script with the provided arguments: **"yellow"**, **"2023"**, and **"5"** ###### 6.3 Run Docker Run from terminal: To build your docker image, replace **"<name>"** to any name of your choice, here "my-model" is used. So `docker build -t <name> .` `docker run my-model` ``` $ docker run my-model reading the data from https://d37ci6vzurychx.cloudfront.net/trip-data/yellow_tripdata_2023-05.parquet... loading the model with RUN_ID=model.bin... applying the model... Q6. Mean of predictions: 0.192 saving the result to ../output_files/yellow/2023-05.parquet... ``` That's it! Let me know if you have any challenges. **NB** If you are visiting the Author's repository [here](https://github.com/AkanimohOD19A/MLOps_24/tree/main/wk4), the difference between **starter.py** and **script.py** is the latter is built to have the pre-built model from the FROM agrigorev/zoomcamp-model:mlops-2024-3.10.13-slim docker image.

afrologicinsect

My Journey Through Laracasts: 30 Days to Learn Laravel

As a developer, continuous learning is crucial. Every few months, I focus on picking up new skills or...

https://dev.to/hassanshahzadaheer/my-journey-through-laracasts-30-days-to-learn-laravel-34ee

laravel, webdev, beginners

As a developer, continuous learning is crucial. Every few months, I focus on picking up new skills or brushing up on old ones. Recently, I completed the "30 Days to Learn Laravel" series by Jeffrey Way on Laracasts, and I wanted to share my experience. It was an incredibly rewarding journey, and I think every developer, especially beginners, would benefit from it. ### Getting Started Before diving into the series, I set a clear goal: to solidify my understanding of Laravel from the ground up. I chose this course because Jeffrey Way is known for breaking down complex concepts into easy-to-understand lessons. His approach was exactly what I needed. ### What I Learned Here's a rundown of some key takeaways from the series: 1. **Tailwind Layouts:** One of the most amazing parts of the course was learning about Tailwind CSS. Jeffrey showed how to break down complex layouts into simple, reusable components, which is essential for creating clean and maintainable code. 2. **Authentication and Authorization:** This was a tricky area for me, but the course covered it thoroughly. I learned about six different methods of authorization and built my own login and registration systems. Now, I feel confident implementing secure authentication in my projects. 3. **Model Factories:** I discovered how model factories make it easy to scaffold example data for testing and setting up a local environment. Laravel simplifies this process, making it a breeze. 4. **Eloquent Relationships:** Understanding eager loading and the N+1 problem was another highlight. These concepts are crucial for optimizing database queries and improving application performance. 5. **Queues:** Queues are a game-changer for handling tasks like sending emails without making users wait. Jeffrey explained the entire process in a way that was easy to grasp, and now I can implement queues to improve user experience. 6. **Build Process:** Getting my build process in order was another valuable lesson. I learned six different ways to create policies in Laravel, which will help me write cleaner and more efficient code. 7. **Final Project:** The series wrapped up with a final project that pulled together everything we had learned. It was great to see how all the pieces fit together in a real-world application. ### Reflections and Recommendations Revisiting Laravel through this structured series was a game-changer. The step-by-step progression from basic to advanced topics ensured I understood each concept thoroughly before moving on. Jeffrey Way’s teaching style, blending theory with practical examples, made the learning process enjoyable and effective. For anyone looking to deepen their understanding of Laravel, I highly recommend this course. It’s an excellent resource for both beginners and those wanting to refresh their skills. You can check out the course [here](https://laracasts.com/series/30-days-to-learn-laravel-11). ### Conclusion The "30 Days to Learn Laravel" series was a fantastic experience that reinforced the importance of consistent learning and tackling challenges head-on. As developers, we must always be willing to learn and apply new things, expanding our knowledge and improving our workflows. I’m excited to continue this journey and look forward to new challenges and opportunities. Follow me on [Twitter](https://twitter.com/hshahzadaheer), [LinkedIn](https://www.linkedin.com/in/hassanshahzadaheer), and [Instagram](https://www.instagram.com/hassan_aheer) for more insights and updates!

hassanshahzadaheer

Hướng Dẫn Cách Chèn Video Vào WordPress

Chèn video vào website được thiết kế bằng WordPress đang trở thành một xu hướng ngày càng phổ biến....

https://dev.to/terus_technique/huong-dan-cach-chen-video-vao-wordpress-1cjh

website, digitalmarketing, seo, terus

 Chèn video vào [website được thiết kế bằng WordPress](https://terusvn.com/thiet-ke-website-tai-hcm/) đang trở thành một xu hướng ngày càng phổ biến. Với sự phát triển của công nghệ và nhu cầu của người dùng, việc kết hợp video vào nội dung trên WordPress không chỉ giúp tăng tính hấp dẫn mà còn mang lại nhiều lợi ích khác. Có nhiều cách để chèn video YouTube vào WordPress, bao gồm: Dán URL video YouTube trực tiếp vào bài viết. WordPress sẽ tự động nhúng video vào trang. Sử dụng mã iframe để nhúng video. Đây là phương pháp linh hoạt hơn, cho phép bạn tùy chỉnh kích thước và vị trí hiển thị video. Chèn video YouTube vào sidebar WordPress bằng các plugin chuyên dụng. Việc chèn video YouTube thay vì tải video lên website trực tiếp mang lại nhiều lợi ích: Tiết kiệm tài nguyên cho server website Cung cấp trải nghiệm tốt hơn cho người dùng Chất lượng video cao hơn Ngoài ra, chèn video YouTube còn giúp tăng lưu lượng truy cập và khả năng chia sẻ nội dung của website. Để chèn video YouTube hiệu quả, bạn cần lưu ý một số điểm sau: Chọn thời gian bắt đầu video phù hợp Chọn thời gian kết thúc video hợp lý Trong bài viết này, Terus đã cung cấp các thông tin để bạn có thể tìm hiểu về cách chèn video YouTube vào WordPress, những plugin hữu ích và những lợi ích mà việc này mang lại. Hy vọng những thông tin này sẽ giúp bạn tăng tính hấp dẫn và trải nghiệm người dùng khi [thiết kế website](https://terusvn.com/thiet-ke-website-tai-hcm/) cho riêng mình. Nếu cần hỗ trợ thêm về SEO và các dịch vụ marketing số, đừng ngần ngại liên hệ với Terus. Tìm hiểu thêm về [Hướng Dẫn Cách Chèn Video Vào WordPress](https://terusvn.com/thiet-ke-website/huong-dan-chen-video-vao-wordpress/) Các dịch vụ tại Terus: Digital Marketing: · [Dịch vụ Facebook Ads](https://terusvn.com/digital-marketing/dich-vu-facebook-ads-tai-terus/) · [Dịch vụ Google Ads](https://terusvn.com/digital-marketing/dich-vu-quang-cao-google-tai-terus/) · [Dịch vụ SEO Tổng Thể](https://terusvn.com/seo/dich-vu-seo-tong-the-uy-tin-hieu-qua-tai-terus/) Thiết kế website: · [Dịch vụ Thiết kế website chuẩn Insight](https://terusvn.com/thiet-ke-website/dich-vu-thiet-ke-website-chuan-insight-chuyen-nghiep-uy-tin-tai-terus/) · [Dịch vụ Thiết kế website](https://terusvn.com/thiet-ke-website-tai-hcm/)

terus_technique

Xác Minh Quyền Sở Hữu Tên Miền Với Google Search Console

Google Search Console, trước đây được biết đến với tên Google Webmaster Tools, là một công cụ miễn...

https://dev.to/terus_technique/xac-minh-quyen-so-huu-ten-mien-voi-google-search-console-laj

website, digitalmarketing, seo, terus

 Google Search Console, trước đây được biết đến với tên Google Webmaster Tools, là một công cụ miễn phí do Google cung cấp giúp quản trị và [theo dõi hiệu quả hoạt động của website](https://terusvn.com/thiet-ke-website-tai-hcm/) trên công cụ tìm kiếm của Google. Với Search Console, các chủ sở hữu website có thể: Giám sát và khắc phục các vấn đề kỹ thuật ảnh hưởng đến việc hiển thị website trên kết quả tìm kiếm của Google. Theo dõi và phân tích lưu lượng truy cập, hiệu suất và các chỉ số khác của website. Cung cấp thông tin về các liên kết đến website từ các trang web khác. Gửi bản đồ trang web và yêu cầu chỉ mục nhanh chóng hơn. Nhận các thông báo và gợi ý từ Google về cách cải thiện website. Việc xác minh quyền sở hữu tên miền với Google Search Console là rất quan trọng vì nó: Cho phép bạn truy cập và quản lý thông tin website của mình trên Google Search Console. Giúp Google xác định bạn là chủ sở hữu hợp pháp của tên miền, từ đó cung cấp thông tin chính xác về website của bạn trong kết quả tìm kiếm. Cho phép bạn nhận được các cảnh báo, gợi ý và thông tin quan trọng từ Google về website của mình. Tăng độ tin cậy và uy tín của website, giúp cải thiện vị trítrong kết quả tìm kiếm. Thời gian xác minh quyền sở hữu tên miền với Google Search Console thường chỉ mất vài phút đến vài giờ. Tuy nhiên, trong một số trường hợp, việc xác minh có thể kéo dài hơn, ví dụ như: Nếu bạn sử dụng DNS tùy chỉnh hoặc bạn đang sử dụng một nhà cung cấp lưu trữ không phổ biến, thì quá trình xác minh có thể kéo dài hơn. Nếu bạn đã thêm một số bản ghi TXT hoặc các yêu cầu xác minh khác vào tên miền, Google cần thời gian để kiểm tra và xác minh các bản ghi đó. Nếu bạn vừa mới chuyển đổi hoặc thay đổi tên miền, thì quá trình xác minh cũng có thể mất nhiều thời gian hơn. Xác minh quyền sở hữu tên miền với Google Search Console là một bước quan trọng giúp bạn [quản lý và theo dõi hiệu suất website](https://terusvn.com/thiet-ke-website-tai-hcm/) một cách hiệu quả. Quá trình này thường nhanh chóng và đơn giản, chỉ mất vài phút. Tuy nhiên, trong một số trường hợp, nó có thể kéo dài hơn tùy thuộc vào cấu hình tên miền và các yêu cầu xác minh bổ sung. Nếu gặp bất kỳ sự cố nào, hãy tham khảo các hướng dẫn và tài liệu hỗ trợ của Google để được trợ giúp. Tìm hiểu thêm về[ Xác Minh Quyền Sở Hữu Tên Miền Với Google Search Console](https://terusvn.com/thiet-ke-website/xac-minh-quyen-so-huu-ten-mien-gsc/) Các dịch vụ tại Terus: Digital Marketing: · [Dịch vụ Facebook Ads](https://terusvn.com/digital-marketing/dich-vu-facebook-ads-tai-terus/) · [Dịch vụ Google Ads](https://terusvn.com/digital-marketing/dich-vu-quang-cao-google-tai-terus/) · [Dịch vụ SEO Tổng Thể](https://terusvn.com/seo/dich-vu-seo-tong-the-uy-tin-hieu-qua-tai-terus/) Thiết kế website: · [Dịch vụ Thiết kế website chuẩn Insight](https://terusvn.com/thiet-ke-website/dich-vu-thiet-ke-website-chuan-insight-chuyen-nghiep-uy-tin-tai-terus/) · [Dịch vụ Thiết kế website](https://terusvn.com/thiet-ke-website-tai-hcm/)

terus_technique

Thiết Kế Website Tuyển Dụng Đầy Đủ Chức Năng

Website tuyển dụng đóng vai trò quan trọng trong quá trình tuyển dụng nhân sự của doanh nghiệp. Nó...

https://dev.to/terus_technique/thiet-ke-website-tuyen-dung-day-du-chuc-nang-3nmf

website, digitalmarketing, seo, terus

 Website tuyển dụng đóng vai trò quan trọng trong quá trình tuyển dụng nhân sự của doanh nghiệp. Nó cung cấp một nền tảng trực tuyến để doanh nghiệp quảng bá vị trí việc làm, tiếp nhận và quản lý các ứng viên một cách hiệu quả. Các lợi ích khi sử dụng [dịch vụ thiết kế website tuyển dụng chuyên nghiệp và uy tín](https://terusvn.com/thiet-ke-website-tai-hcm/) bao gồm: Đối với doanh nghiệp tuyển dụng: Tăng tính chuyên nghiệp và uy tín của thương hiệu doanh nghiệp Thu hút và tiếp cận được số lượng lớn ứng viên tiềm năng Quản lý đơn ứng tuyển và hồ sơ ứng viên một cách có hệ thống Nâng cao hiệu quả quá trình tuyển dụng và giảm chi phí Đối với ứng viên: Dễ dàng tìm kiếm và ứng tuyển các vị trí phù hợp Nộp đơn ứng tuyển nhanh chóng và thuận tiện Theo dõi được tình trạng đơn ứng tuyển của mình Ngoài ra, việc [thiết kế website tuyển dụng chuyên nghiệp](https://terusvn.com/thiet-ke-website-tai-hcm/) còn giúp doanh nghiệp tiết kiệm được thời gian và chi phí so với các phương thức tuyển dụng truyền thống. Các chức năng chính của một website tuyển dụng chuyên nghiệp bao gồm: Thiết kế giao diện và đồ họa thu hút, dễ sử dụng Module quản lý đối tác, nhà tuyển dụng và ứng viên Module tiện ích và công cụ khảo sát ý kiến Module tìm kiếm và lọc ứng viên Module quảng cáo, marketing online Module liên hệ trực tuyến Module thống kê lượt truy cập Đa ngôn ngữ Ngoài ra, các tính năng đặc biệt của website tuyển dụng bao gồm: Công cụ giới thiệu về công ty/doanh nghiệp Module dành riêng cho nhà tuyển dụng và ứng viên Chức năng cập nhật tin tức, blog Công cụ quản trị website toàn diện Dịch vụ này mang lại nhiều lợi ích cho doanh nghiệp như tăng tính chuyên nghiệp, tiếp cận nhiều ứng viên, tiết kiệm chi phí,... Quy trình thiết kế chu đáo và có sự tư vấn, hỗ trợ từ đội ngũ chuyên gia của Terus. Liên hệ với Terus ngay để được tư vấn. Tìm hiểu thêm về [Thiết Kế Website Tuyển Dụng Đầy Đủ Chức Năng](https://terusvn.com/thiet-ke-website/terus-thiet-ke-website-tuyen-dung/) Các dịch vụ tại Terus: Digital Marketing: · [Dịch vụ Facebook Ads](https://terusvn.com/digital-marketing/dich-vu-facebook-ads-tai-terus/) · [Dịch vụ Google Ads](https://terusvn.com/digital-marketing/dich-vu-quang-cao-google-tai-terus/) · [Dịch vụ SEO Tổng Thể](https://terusvn.com/seo/dich-vu-seo-tong-the-uy-tin-hieu-qua-tai-terus/) Thiết kế website: · [Dịch vụ Thiết kế website chuẩn Insight](https://terusvn.com/thiet-ke-website/dich-vu-thiet-ke-website-chuan-insight-chuyen-nghiep-uy-tin-tai-terus/) · [Dịch vụ Thiết kế website](https://terusvn.com/thiet-ke-website-tai-hcm/)

terus_technique

Remote vs Office vs Hybrid? 📍

I've decided to start doing some pools checking the preference of devs over different stuff. I think...

https://dev.to/devonremote/remote-office-hybrid-49f5

discuss, career

I've decided to start doing some pools checking the preference of devs over different stuff. I think it'll be fun to see what others think or do. Since I don't think we can add pools on dev.to yet, let's use reactions as a way to give it a pool experience :P First question: **What's your working model?** 🦄 - Remote ❤️ - Office 🤯 - Hybrid --- Sub-questions for a discussion :P **Do you like it? How long do you work in this model?**

devonremote

188Bet là thương hiệu sòng bạc trực tuyến đình đám tại châu Á

188Bet là thương hiệu sòng bạc trực tuyến đình đám tại châu Á những năm gần đây, là địa chỉ uy tín,...

https://dev.to/188bethaus/188bet-la-thuong-hieu-song-bac-truc-tuyen-dinh-dam-tai-chau-a-5flp

188Bet là thương hiệu sòng bạc trực tuyến đình đám tại châu Á những năm gần đây, là địa chỉ uy tín, chuyên nghiệp, được đông đảo người chơi đánh giá rất cao. Nhờ kho trò chơi khổng lồ, nhà cái mang đến cho thành viên hàng loạt danh mục sản phẩm độc đáo, đa dạng. Với sự cam kết của mình về chất lượng và sự đổi mới, 188 Bet đã trở thành đơn vị hàng đầu trong ngành giải trí cá cược online. Website :    https://188bet.haus/ Hotline : 0356985201 Địa chỉ : 188 Đường Bình Mỹ, Bình Mỹ, Củ Chi, Hồ Chí Minh, Việt Nam Email : [email protected] Hastag : #188bet #188bethaus https://188bethaus.hashnode.dev/188bet-haus https://profile.hatena.ne.jp/game188bethaus/profile https://www.reverbnation.com/artist/188bethaus https://www.designspiration.com/stonesmamie/saves/ https://tupalo.com/en/users/6968286 https://comiko.net/u/2081154-game188bethaus https://skitterphoto.com/photographers/101508/game188bethaus https://www.fitday.com/fitness/forums/members/188bethaus.html https://bato.to/u/2081154-game188bethaus https://www.speedrun.com/users/188bethaus https://www.longisland.com/profile/188bethaus https://readtoto.net/u/2081154-game188bethaus https://personaljournal.ca/188bethaus/188bet-la-thuong-hieu-song-bac-truc-tuyen-dinh-dam-tai-chau-a-nhung-nam-gan https://zbato.org/u/2081154-game188bethaus https://postheaven.net/80ksxpa229 https://www.divephotoguide.com/user/188bethaus https://writeablog.net/92v6llaipj https://500px.com/p/stonesmamie?view=photos#google_vignette https://readtoto.org/u/2081154-game188bethaus https://en.bio-protocol.org/userhome.aspx?id=1514198 https://starity.hu/profil/461902-game188bethaus/ https://www.facer.io/u/188bethaus https://www.jointcorners.com/188bethaus https://xbato.com/u/2081154-game188bethaus https://gitlab.aicrowd.com/mamie_stones https://rebrickable.com/users/188bethaus/ https://188bethaus.gallery.ru/ https://batocomic.org/u/2081154-game188bethaus https://app.talkshoe.com/user/188bethaus https://www.bigoven.com/user/188bethaus https://doodleordie.com/profile/88bethaus https://velog.io/@188bethaus/188bet https://www.curioos.com/188bethaus https://www.dermandar.com/user/188bethaus/ https://forum.m5stack.com/user/188bethaus http://molbiol.ru/forums/index.php?showuser=1361199 https://www.bitsdujour.com/profiles/T9fkVT https://notabug.org/188bethaus https://batotwo.com/u/2081154-game188bethaus https://socialtrain.stage.lithium.com/t5/user/viewprofilepage/user-id/73936 https://www.wpgmaps.com/forums/users/188bethaus/ http://users.atw.hu/tuleles/phpBB2/profile.php?mode=viewprofile&u=37765 https://community.alteryx.com/t5/user/viewprofilepage/user-id/601279 https://batotoo.com/u/2081154-game188bethaus https://8tracks.com/188bethaus https://app.net/profile/188bethaus https://app.roll20.net/users/13527031/188bethaus https://battwo.com/u/2081154-game188bethaus https://allmyfaves.com/188bethaus https://besayaeuropa.es/profiles/188bethaus/timeline https://www.fimfiction.net/user/765214/188bethaus https://www.bricklink.com/aboutMe.asp?u=188bethaus https://www.zotero.org/188bethaus/cv https://stocktwits.com/188bethaus https://gifyu.com/188bethaus https://os.mbed.com/users/188bethaus/ https://www.renderosity.com/users/id:1518990 https://community.arlo.com/t5/user/viewprofilepage/user-id/978134 https://fileforum.com/profile/188bethaus https://worldcosplay.net/member/1787983 https://app.scholasticahq.com/scholars/303140-188bet-haus https://zzb.bz/1UYpg http://mayfever.crowdfundhq.com/users/188bet-189 https://forum.profa.ne/user/188bethaus https://f319.com/members/188bethaus.851415/ https://lifeinsys.com/user/188bethaus https://vnxf.vn/members/188bethaus.85614/#about https://fewpal.com/188bethaus https://apk.tw/?6457779 https://careers.gita.org/profiles/4900223-188bet-haus https://webflow.com/@188bethaus https://qooh.me/188bethaus https://www.projectnoah.org/users/stonesmamie https://web.ggather.com/188bethaus https://www.notebook.ai/users/846336 https://py.checkio.org/user/188bethaus/ https://xbato.net/u/2081154-game188bethaus https://www.checkli.com/188bethaus https://xbato.org/u/2081154-game188bethaus https://nhattao.com/members/user6554561.6554561/ https://zbato.com/u/2081154-game188bethaus https://careers.mntech.org/profiles/4900126-188bet-haus https://graphcommons.com/me?f=member https://gettogether.community/profile/143135/ https://designaddict.com/community/profile/188bethaus/ https://zbato.net/u/2081154-game188bethaus https://forum.trackandfieldnews.com/member/495595-188bethaus/about https://lazi.vn/user/bet.haus https://www.metooo.it/u/188bethaus https://dreevoo.com/profile.php?pid=654146 https://www.voyage-to.me/188bethaus

188bethaus

How to Create a "Show Password" Toggle

Welcome to codeswithpankaj.com! In this tutorial, we will create a simple "Show Password" toggle...

https://dev.to/codeswithpankaj/how-to-create-a-show-password-toggle-4me0

webdev, javascript, beginners, programming

Welcome to codeswithpankaj.com! In this tutorial, we will create a simple "Show Password" toggle functionality using HTML, CSS, and JavaScript. This feature allows users to toggle the visibility of their password while typing, enhancing user experience in web forms. #### Step 1: Create the HTML Structure First, create the basic HTML structure for your form. This includes an input field for the password and a checkbox to toggle the visibility. ```html <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Show Password Toggle</title> </head> <body> <form> <label for="password">Password:</label> <input type="password" id="password" name="password"> <label for="togglePassword">Show Password</label> <input type="checkbox" id="togglePassword"> </form> <script src="script.js"></script> </body> </html> ``` #### Step 2: Add the JavaScript Next, add the JavaScript code to handle the toggle functionality. This script listens for changes to the checkbox and toggles the type of the password input field accordingly. ```javascript document.getElementById("togglePassword").addEventListener("change", function() { var passwordInput = document.getElementById("password"); if (this.checked) { passwordInput.type = "text"; } else { passwordInput.type = "password"; } }); ``` Save this JavaScript code in a file named `script.js`. #### Step 3: Style the Form (Optional) You can add some basic CSS to style the form and make it look better. This step is optional but recommended for a better user experience. ```html <style> form { max-width: 300px; margin: 0 auto; padding: 20px; border: 1px solid #ccc; border-radius: 5px; } label { display: block; margin-bottom: 10px; } input[type="password"], input[type="text"] { width: 100%; padding: 8px; margin-bottom: 10px; border: 1px solid #ccc; border-radius: 5px; } </style> ``` #### Final Code Combine the HTML and CSS into a single file for simplicity, and include the JavaScript as an external file. ```html <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Show Password Toggle</title> <style> form { max-width: 300px; margin: 0 auto; padding: 20px; border: 1px solid #ccc; border-radius: 5px; } label { display: block; margin-bottom: 10px; } input[type="password"], input[type="text"] { width: 100%; padding: 8px; margin-bottom: 10px; border: 1px solid #ccc; border-radius: 5px; } </style> </head> <body> <form> <label for="password">Password:</label> <input type="password" id="password" name="password"> <label for="togglePassword">Show Password</label> <input type="checkbox" id="togglePassword"> </form> <script src="script.js"></script> </body> </html> ``` Save this file as `index.html` and the JavaScript code as `script.js`. Open `index.html` in your web browser to see the "Show Password" toggle in action. --- For more tutorials, visit [codeswithpankaj.com](https://www.codeswithpankaj.com/)

codeswithpankaj

Lỗi 404 Page Not Found Là Gì? Cách Sửa Lỗi

Lỗi 404 là một mã lỗi HTTP phổ biến, cho biết rằng trình duyệt không thể tìm thấy trang web được yêu...

https://dev.to/terus_technique/loi-404-page-not-found-la-gi-cach-sua-loi-3j1p

website, digitalmarketing, seo, terus

 Lỗi 404 là một mã lỗi HTTP phổ biến, cho biết rằng trình duyệt không thể tìm thấy trang web được yêu cầu. Đây là phản hồi tiêu chuẩn khi máy chủ không thể định vị được tài nguyên được yêu cầu. Điều này thường xảy ra khi một trang web đã bị xóa, di chuyển hoặc URL bị hỏng. Khi lỗi 404 xảy ra, người dùng sẽ nhìn thấy một thông báo lỗi thông báo rằng không thể tìm thấy trang được yêu cầu. Một số trang web có thể hiển thị các trang lỗi 404 tùy chỉnh, bao gồm thêm thông tin hoặc các đề xuất cho người dùng. Những người khác chỉ hiển thị một thông báo chung kèm theo mã lỗi và giải thích ngắn gọn. Lỗi 404 thường xảy ra khi [thiết kế website sử dụng nền tảng WordPress](https://terusvn.com/thiet-ke-website-tai-hcm/). Một nguyên nhân phổ biến là khi một bài viết bị xóa hoặc di chuyển. Nó cũng có thể xảy ra do cấu trúc URL thay đổi hoặc khi một plugin hoặc chủ đề bị lỗi. Lỗi 404 có thể ảnh hưởng tiêu cực đến trải nghiệm người dùng và cả SEO của trang web. Nó có thể dẫn đến tỷ lệ thoát cao, ảnh hưởng đến thời gian trên trang và chỉ số tương tác. Đối với SEO, lỗi 404 có thể làm giảm thứ hạng và [lưu lượng truy cập của trang web](https://terusvn.com/thiet-ke-website-tai-hcm/). Có nhiều cách để khắc phục lỗi 404 và cải thiện trải nghiệm của người dùng. Một số phương pháp bao gồm: Tối ưu hóa trang lỗi 404: Tạo một trang lỗi 404 tùy chỉnh với thông tin hữu ích, liên kết liên quan và tùy chọn tìm kiếm. Điều này có thể giúp giữ chân người dùng thay vì họ rời khỏi trang web. Chuyển hướng người dùng đến một trang có liên quan: Thay vì hiển thị trang lỗi 404, hãy chuyển hướng người dùng đến một trang web liên quan hoặc trang chủ. Điều này giúp cải thiện trải nghiệm người dùng và giữ chân họ trên trang web. Sử dụng công cụ để xác định và sửa lỗi 404: Có nhiều công cụ như Google Search Console, Screaming Frog và Ahrefs có thể giúp định vị và sửa các lỗi 404 trên trang web. Cập nhật liên kết: Kiểm tra và cập nhật bất kỳ liên kết hỏng nào trên trang web, bao gồm cả các liên kết nội bộ và liên kết từ các trang bên ngoài. Xử lý lỗi 404 một cách hiệu quả không chỉ cải thiện trải nghiệm người dùng mà còn giúp tăng thứ hạng và lưu lượng truy cập của trang web. Bằng cách áp dụng các chiến lược khắc phục lỗi 404, các chủ sở hữu trang web có thể giữ chân người dùng và thúc đẩy thành công trực tuyến của họ. Tìm hiểu thêm về [Lỗi 404 Page Not Found Là Gì? Cách Sửa Lỗi](https://terusvn.com/thiet-ke-website/loi-404-page-not-found-error-la-gi/) Digital Marketing: · [Dịch vụ Facebook Ads](https://terusvn.com/digital-marketing/dich-vu-facebook-ads-tai-terus/) · [Dịch vụ Google Ads](https://terusvn.com/digital-marketing/dich-vu-quang-cao-google-tai-terus/) · [Dịch vụ SEO Tổng Thể](https://terusvn.com/seo/dich-vu-seo-tong-the-uy-tin-hieu-qua-tai-terus/) Thiết kế website: · [Dịch vụ Thiết kế website chuẩn Insight](https://terusvn.com/thiet-ke-website/dich-vu-thiet-ke-website-chuan-insight-chuyen-nghiep-uy-tin-tai-terus/) · [Dịch vụ Thiết kế website](https://terusvn.com/thiet-ke-website-tai-hcm/)

terus_technique

Redirect 301 Là Gì? Liệu Redirect 301 Có Lợi Gì Cho SEO

Các đơn vị cung cấp dịch vụ thiết kế website chuyên nghiệp đã quá quen với thuật ngữ Redirect, đây...

https://dev.to/terus_technique/redirect-301-la-gi-lieu-redirect-301-co-loi-gi-cho-seo-4b8g

website, digitalmarketing, seo, terus

 Các [đơn vị cung cấp dịch vụ thiết kế website chuyên nghiệp](https://terusvn.com/thiet-ke-website-tai-hcm/) đã quá quen với thuật ngữ Redirect, đây là kỹ thuật chuyển hướng một URL cũ sang một URL mới. Có nhiều loại redirect khác nhau, bao gồm: Redirect từ phía khách hàng (client-side redirects): Khi người dùng truy cập vào một URL cụ thể, trình duyệt sẽ tự động chuyển hướng sang một URL khác. Mặc dù loại redirect này không mang lại nhiều lợi ích về mặt SEO, nó vẫn được sử dụng trong một số trường hợp nhất định. Redirect từ phía máy chủ (server-side redirects): Đây là loại redirect được thực hiện trực tiếp trên máy chủ, khi người dùng truy cập vào một URL cụ thể, họ sẽ được chuyển hướng sang một URL khác. Loại redirect này mang lại nhiều lợi ích về mặt SEO. Redirect 301 là một loại redirect từ phía máy chủ, được sử dụng khi một website hoặc một URL cũ được chuyển đến một URL mới. Redirect 301 thông báo cho công cụ tìm kiếm rằng website hoặc URL cũ đã được chuyển vĩnh viễn sang một URL mới. Lợi ích của Redirect 301 đối với SEO: Giữ nguyên thứ hạng và thứ bậc trong công cụ tìm kiếm: Khi một URL cũ được chuyển sang một URL mới thông qua Redirect 301, công cụ tìm kiếm như Google sẽ nhận biết rằng đây là một chuyển hướng vĩnh viễn và sẽ chuyển toàn bộ thứ hạng và thứ bậc của URL cũ sang URL mới. Giữ nguyên backlink: Tất cả các backlink trỏ về URL cũ sẽ được chuyển sang URL mới, giúp tăng uy tín và thứ hạng của website. Cải thiện trải nghiệm người dùng: Khi người dùng truy cập vào URL cũ, họ sẽ được chuyển hướng nhanh chóng và êm ái sang URL mới, tạo ra trải nghiệm tốt hơn. Các trường hợp sử dụng Redirect 301 hiệu quả Khi chuyển đổi tên miền: Khi bạn đổi tên miền từ domain cũ sang domain mới, bạn cần sử dụng Redirect 301 để chuyển hướng toàn bộ lưu lượng truy cập từ domain cũ sang domain mới. Khi thay đổi cấu trúc URL: Khi bạn thay đổi cấu trúc URL của một website hoặc một danh mục, bạn cần sử dụng Redirect 301 để chuyển hướng các URL cũ sang URL mới. Khi tái cấu trúc lại website: Khi bạn tiến hành tái cấu trúc lại toàn bộ website, cần sử dụng Redirect 301 để chuyển hướng các trang cũ sang các trang mới tương ứng. Redirect 301 là một kỹ thuật [SEO hiệu quả](https://terusvn.com/seo/dich-vu-seo-tong-the-uy-tin-hieu-qua-tai-terus/), giúp chuyển hướng các URL cũ sang URL mới một cách vĩnh viễn. Nó có thể giúp duy trì thứ hạng, giữ nguyên backlink và cải thiện trải nghiệm người dùng. Tuy nhiên, việc sử dụng Redirect 301 cần được thực hiện một cách cẩn thận và có kế hoạch, tránh các lỗi có thể xảy ra. Tìm hiểu thêm về [Redirect 301 Là Gì? Liệu Redirect 301 Có Lợi Gì Cho SEO](https://terusvn.com/thiet-ke-website/redirect-301-la-gi/) Các dịch vụ tại Terus: Digital Marketing: · [Dịch vụ Facebook Ads](https://terusvn.com/digital-marketing/dich-vu-facebook-ads-tai-terus/) · [Dịch vụ Google Ads](https://terusvn.com/digital-marketing/dich-vu-quang-cao-google-tai-terus/) · [Dịch vụ SEO Tổng Thể](https://terusvn.com/seo/dich-vu-seo-tong-the-uy-tin-hieu-qua-tai-terus/) Thiết kế website: · [Dịch vụ Thiết kế website chuẩn Insight](https://terusvn.com/thiet-ke-website/dich-vu-thiet-ke-website-chuan-insight-chuyen-nghiep-uy-tin-tai-terus/) · [Dịch vụ Thiết kế website](https://terusvn.com/thiet-ke-website-tai-hcm/)

terus_technique

Early Beginnings of Betting in Belgium

Betting in Belgium has a rich and varied history, rooted deeply in traditional practices before...

https://dev.to/meridianbet/early-beginnings-of-betting-in-belgium-58c1

 Betting in Belgium has a rich and varied history, rooted deeply in traditional practices before evolving into the sophisticated online platforms we see today. The initial phase of betting in Belgium involved a mix of informal and formal activities. These ranged from local card games and lotteries to more organized forms of betting on horse racing and other sports. As technology advanced and the internet became more accessible, these traditional methods began to evolve, paving the way for the emergence of online betting platforms. In the late 1990s and early 2000s, Belgium saw the first wave of online betting platforms. These early platforms were rudimentary by today's standards but marked a significant shift from traditional betting practices. The convenience of placing bets from the comfort of one's home, coupled with the ability to access a wider range of betting options, made online betting an attractive alternative. This period marked the beginning of a new era in the Belgian betting scene, setting the stage for rapid growth and development in the following years. The early online betting platforms in Belgium were initially met with a mix of enthusiasm and skepticism. Enthusiasts were excited about the new possibilities that online betting offered, such as real-time updates and a broader selection of betting markets. However, there were also concerns about the security and fairness of these platforms. The lack of robust regulatory frameworks in the early days of online betting meant that consumers had to be cautious and discerning when choosing which platforms to trust. Despite these challenges, the popularity of online betting continued to grow. By the mid-2000s, several established betting companies had launched their online platforms in Belgium, contributing to the mainstream acceptance of online betting. The accessibility and convenience of online betting, combined with technological advancements, helped to attract a new generation of bettors. This shift was further accelerated by the widespread use of smartphones and mobile internet, allowing people to place bets anytime and anywhere. In conclusion, the early beginnings of online betting in Belgium were characterized by a transition from traditional betting practices to innovative online platforms. This period laid the foundation for the current landscape of online betting in Belgium, which is now a well-regulated and thriving industry. As the industry continues to evolve, it is clear that online betting will remain a significant part of Belgium's betting culture. For more information on the history and current trends in [belgium bet](https://meridianbet.be/) Regulatory Evolution The regulatory landscape for online betting in Belgium has undergone significant transformations over the years, evolving in response to the growing popularity and complexity of the industry. The introduction of betting laws was a crucial step in shaping the current environment, ensuring that the industry operates within a framework that protects consumers and maintains fair practices. Introduction of Betting Laws The initial phase of regulation began with the establishment of basic laws to govern traditional forms of betting. These laws provided a foundation but were not equipped to handle the nuances of online betting. Recognizing the need for a more robust regulatory framework, the Belgian government took decisive steps in the early 2000s to address the unique challenges posed by online betting. In 2010, the Belgian Gambling Act was enacted, marking a significant milestone in the regulation of both online and offline gambling activities. This act aimed to create a safer and more transparent betting environment by introducing stringent licensing requirements for operators. Only those companies that met the strict criteria set by the Belgian Gaming Commission were allowed to offer their services to Belgian citizens. This move not only protected consumers but also ensured that the industry was free from fraudulent and unethical practices. The Gambling Act also introduced measures to combat problem gambling. Operators were required to implement responsible gambling tools, such as self-exclusion options and deposit limits, to help players manage their betting activities. Additionally, advertising restrictions were put in place to prevent aggressive marketing tactics that could lead to excessive gambling. Impact of European Union Regulations Belgium's regulatory framework for online betting has also been influenced by broader European Union (EU) regulations. As a member of the EU, Belgium is required to comply with directives that aim to harmonize gambling laws across member states. These directives are designed to ensure a high level of consumer protection and to promote fair competition within the industry. One of the key EU directives that impacted Belgian betting regulations was the Anti-Money Laundering Directive. This directive mandated that all betting operators implement strict measures to prevent money laundering and terrorist financing. As a result, Belgian operators had to enhance their verification processes and report suspicious activities to the authorities. The EU also played a role in promoting cross-border cooperation among member states. This cooperation is crucial for tackling issues such as illegal betting and ensuring that regulatory standards are upheld across different jurisdictions. By aligning its regulations with EU directives, Belgium has been able to create a more cohesive and effective regulatory environment for online betting. In conclusion, the regulatory evolution of online betting in Belgium has been shaped by both national initiatives and broader European influences. The introduction of comprehensive betting laws and the alignment with EU regulations have created a well-regulated and secure environment for online betting in Belgium. These efforts have not only protected consumers but also ensured the integrity and fairness of the industry, paving the way for its continued growth and development. Growth and Expansion of Online Betting The growth and expansion of online betting in Belgium have been remarkable, driven by technological advancements and a burgeoning interest among bettors. From the early days of basic online platforms to the sophisticated and user-friendly sites available today, the evolution of online betting has transformed the industry, making it more accessible and engaging for users. Popular Online Betting Platforms Several online betting platforms have established themselves as leaders in the Belgian market, offering a wide range of betting options and services. Among these, [Meridianbet Belgium](https://meridianbet.be/) stands out as a prominent player, providing an extensive selection of sports betting, casino games, and other gambling opportunities. Meridianbet Belgium, along with other major platforms, has capitalized on the growing demand for online betting by continuously enhancing their offerings. These platforms provide users with an array of sports to bet on, from popular sports like football and tennis to niche markets like eSports and virtual sports. Additionally, they offer live betting options, allowing users to place bets in real-time as events unfold, adding an extra layer of excitement and engagement. Promotional offers and bonuses have also played a significant role in attracting and retaining customers. Welcome bonuses, free bets, and loyalty programs are commonly used by these platforms to entice new users and reward regular bettors. These incentives have helped to build a loyal customer base and drive the growth of the industry. Technological Advancements in Online Betting Technological advancements have been a key driver of the growth and expansion of online betting in Belgium. The development of mobile technology, in particular, has revolutionized the industry. With the widespread use of smartphones and tablets, bettors can now place bets anytime, anywhere, without being tied to a desktop computer. Mobile apps developed by leading betting platforms provide a seamless and user-friendly experience, making it easier for users to navigate and place bets on the go. The integration of advanced features such as live streaming, in-play betting, and cash-out options has further enhanced the user experience. Live streaming allows users to watch events in real-time, directly on the betting platform, making it easier to make informed betting decisions. In-play betting offers the opportunity to place bets during an event, reacting to the action as it happens. The cash-out feature allows users to secure a portion of their winnings before an event has concluded, providing more control over their bets. Moreover, the use of data analytics and artificial intelligence has improved the accuracy and personalization of betting services. These technologies enable platforms to offer personalized recommendations, tailored promotions, and detailed statistics to help users make more informed decisions. Enhanced security measures, such as two-factor authentication and advanced encryption, have also been implemented to protect users' personal and financial information, building trust and confidence in online betting platforms. In conclusion, the growth and expansion of online betting in Belgium have been driven by the rise of popular betting platforms and significant technological advancements. These developments have made online betting more accessible, engaging, and secure, contributing to the rapid growth of the industry. As technology continues to evolve, the online betting landscape in Belgium is likely to see further innovations and improvements, enhancing the overall experience for bettors.

meridianbet

Google Search Là Gì? Quy Trình Hoạt Động

Google Search là một công cụ tìm kiếm trực tuyến rất phổ biến và được sử dụng rộng rãi trên toàn...

https://dev.to/terus_technique/google-search-la-gi-quy-trinh-hoat-dong-58c

website, digitalmarketing, seo, terus

 Google Search là một công cụ tìm kiếm trực tuyến rất phổ biến và được sử dụng rộng rãi trên toàn thế giới. Nó được phát triển và vận hành bởi công ty công nghệ lớn nhất thế giới - Google. Mục đích chính của Google Search là giúp người dùng tìm kiếm và truy cập thông tin, tài liệu, [dịch vụ thiết kế website](https://terusvn.com/thiet-ke-website-tai-hcm/), hình ảnh, video... một cách nhanh chóng và hiệu quả trên internet. Quy trình hoạt động của Google Search bao gồm 3 bước chính: Tìm kiếm dữ liệu: Google sử dụng các "crawler" (hay còn gọi là "spider") để tự động khám phá, thu thập và lưu trữ nội dung của các website trên internet. Quá trình này được gọi là "crawling" và "indexing". Google Index: Sau khi thu thập dữ liệu, Google sẽ lưu trữ, phân loại và xếp hạng tất cả những thông tin này vào trong chỉ mục tìm kiếm (index) của mình. Chỉ mục này giúp Google có thể trả về những kết quả tìm kiếm liên quan và chính xác nhất khi người dùng tìm kiếm. Trả về kết quả tìm kiếm: Khi người dùng nhập từ khóa tìm kiếm, Google sẽ nhanh chóng truy xuất và hiển thị những kết quả liên quan nhất từ chỉ mục của mình. Các kết quả này được sắp xếp dựa trên nhiều yếu tố như độ liên quan, chất lượng, uy tín của các trang web... Ngoài những chức năng cơ bản như tìm kiếm thông tin, các [nhà cung cấp dịch vụ thiết kế website chuyên nghiệp](https://terusvn.com/thiet-ke-website-tai-hcm/) còn quan tâm đến rất nhiều tính năng thú vị khác của Google Search mà người dùng chưa biết đến: Cung cấp thông tin về các sự vật, hiện tượng trong thế giới Hướng dẫn tìm đường và cập nhật tình trạng giao thông Theo dõi kết quả trận đấu thể thao Tìm kiếm nội dung cụ thể của một trang web Tra cứu định nghĩa của các từ Kiểm tra lịch bay Chỉ đường chính xác Tìm kiếm hình ảnh Mô phỏng tiếng kêu của động vật Google Search là một công cụ tìm kiếm vô cùng mạnh mẽ và đa năng, được sử dụng rộng rãi trên toàn thế giới. Nó không chỉ giúp người dùng tìm kiếm và truy cập thông tin nhanh chóng mà còn cung cấp nhiều tính năng thú vị và tiện ích khác. Với sự phát triển không ngừng của Google, chúng ta có thể mong đợi sẽ có thêm nhiều cải tiến và tính năng mới trong tương lai. Tìm hiểu thêm về [Google Search Là Gì? Quy Trình Hoạt Động](https://terusvn.com/thiet-ke-website/google-search-la-gi/) Digital Marketing: · [Dịch vụ Facebook Ads](https://terusvn.com/digital-marketing/dich-vu-facebook-ads-tai-terus/) · [Dịch vụ Google Ads](https://terusvn.com/digital-marketing/dich-vu-quang-cao-google-tai-terus/) · [Dịch vụ SEO Tổng Thể](https://terusvn.com/seo/dich-vu-seo-tong-the-uy-tin-hieu-qua-tai-terus/) Thiết kế website: · [Dịch vụ Thiết kế website chuẩn Insight](https://terusvn.com/thiet-ke-website/dich-vu-thiet-ke-website-chuan-insight-chuyen-nghiep-uy-tin-tai-terus/) · [Dịch vụ Thiết kế website](https://terusvn.com/thiet-ke-website-tai-hcm/)

terus_technique

Building Zerocalc, part IV - precision

Performing arithmetic calculations using computers results in limited precision. Operations on...

https://dev.to/michal1024/building-zerocalc-part-iv-precision-2n2i

rust, programming

Performing arithmetic calculations using computers results in limited precision. Operations on integers are accurate up to minimum and maximum values allowed by the selected integer representation. Using the `i128` type we can get any number up to 38 digits long which is enough assuming you will not try to count atoms in the known universe (~10^79). Floating point operations are more challenging as not all values can be represented in the standard used by Rust (IEEE 754). For example: `1.1 * 2.2 = 2.4200000000000004` There are libraries, such as [rug](https://crates.io/crates/rug), that can help us deal with this problem, offering extended precision and big integer operations. For Zerocalc I am going to do something simpler and still get some benefits of improved precision: as long as we operate on integers, we will stick to integers and only switch to floats when necessary. For example, when adding or multiplying integers, the result is an integer. When dividing, if the division has no reminder, we will use integers. I also want to make the operations easy to write just as we used normal primitives, for example, I want to write: ``` x = 1 y = 2 result = x * y ``` and don't think about what primitive types to operate on. To achieve this we will use two Rust features: `enum`s and `std::ops` traits which are similar to C++'s operator overloading. Let's start with defining our numbers. We will derive from `PartialEq` to allow comparisons of `Number` instances: ```rust #[derive(Debug, PartialEq)] pub enum Number { Int(i128), Float(f64), NaN } ``` The extra `NaN` or Not a Number option will help us handle edge cases such as division by `0`. Rust's floating point numbers already have similar values defined as constants such as `std::f64::NAN`. To make it easy to create `Number` instances in tests, we can add a helper conversion implementations: ```rust impl From<f64> for Number { fn from(value: f64) -> Self { if value == std::f64::NAN || value == std::f64::INFINITY || value == std::f64::NEG_INFINITY { Number::NaN } else { Number::Float(value) } } } impl From<Number> for f64 { fn from(value: Number) -> Self { match value { Number::Int(i) => i as f64, Number::Float(f) => f, Number::NaN => f64::NAN } } } impl From<i128> for Number { fn from(value: i128) -> Self { Number::Int(value) } } impl From<Option<i128>> for Number { fn from(value: Option<i128>) -> Self { match value { Some(i) => Number::Int(i), None => Number::NaN } } } ``` With this, we can create a `Number` from actual values easily: ```rust let x: Number = 1.into(); // creates Number::Int(1) let y: Number = 1.0.into(); // creates Number::Float(1.0) ``` You may be wondering why we have two conversions for `i128` - one for the actual integer and one for the option. This will help us to handle errors as we will see in the next step. Now we can define the first operator - addition. The rules for addition will be: * If any operand is NaN, the result is NaN. * If both operands are integers, the result is an integer. * In all other cases (one or both operands are float) the result is float. * If the result cannot be represented as `i128` or `f64` - return NaN. ```rust impl Add for Number { type Output = Number; fn add(self, rhs: Self) -> Self::Output { match (self, rhs) { (Number::NaN, _) | (_, Number::NaN) => Number::NaN, (Number::Int(l), Number::Int(r)) => l.checked_add(r).into(), _ => { let l: f64 = self.into(); let r: f64 = rhs.into(); (l + r).into() } } } } ``` The `checked_add` method returns an option - `Some` if the result can be safely represented as i128, None in other cases. This is where our `From<Option<i281>>` comes in handy. In the case of floats the errors will be returned as predefined constants such as `NAN`. Let's test it! ```rust #[test] fn test_add() { let int1: Number = 1.into(); let int2: Number = 2.into(); assert_eq!(Number::Int(3), int1 + int2); let fl2: Number = 2.0.into(); if let Number::Float(fl_res) = int1 + fl2 { assert!((fl_res - 3.0).abs() < std::f64::EPSILON); } else { panic!("Float expected"); } } ``` Subtraction and multiplication are very similar, in the case of division we need to check if the reminder of dividing two integrals is `0` - if yes, the result will also be `0`. We also have to watch for division by `0` operations. `checked_rem` will handle both for us: ```rust impl Div for Number { type Output = Number; fn div(self, rhs: Self) -> Self::Output { match (self, rhs) { (Number::NaN, _) | (_, Number::NaN) => Number::NaN, (Number::Int(l), Number::Int(r)) => { let rem = l.checked_rem(r); match rem { Some(r) if r > 0 => Number::Float(self.into()) / Number::Float(rhs.into()), Some(_) => Number::Int(l / r), None => Number::NaN } }, _ => { let l: f64 = self.into(); let r: f64 = rhs.into(); (l / r).into() } } } } ``` With this simple approach, we can make easy calculations that will preserve integers as long as possible and will gracefully handle errors. **Bonus** A cautious reader may have noticed the `impl From<Number> for f64` implementation does not do any checks when converting 128 into f64. How can we safely convert a 128-bit integer into an 64-bit float? According to IEEE-754, the 64-bit floating numbers are stored as: * 11 bit exponent * 53 bit precision number Quoting after Wikipedia: >The 11 bit width of the exponent allows the representation of numbers between 10^−308 and 10^308 So there will be rounding errors, but we can store a maximum i128 number; we can even count atoms in the universe! Let's check what happens if we convert `128::MAX`: ```rust fn main() { println!("i128::MAX: {},\ni128::MAX as f64: {}", std::i128::MAX, std::i128::MAX as f64) } ``` Output: ``` i128::MAX: 170141183460469231731687303715884105727, i128::MAX as f64: 170141183460469230000000000000000000000 ``` Sources: https://rtfeldman-rust-workshop.netlify.app/1.2 https://crates.io/crates/rug https://www.wolframalpha.com/input?i=number+of+atoms+in+universe https://en.wikipedia.org/wiki/Double-precision_floating-point_format

michal1024

Thiết Kế Website Đại Lý, Nhà Phân Phối Tối Ưu Chi Phí

Đại lý và nhà phân phối đều là những đơn vị trung gian giữa nhà sản xuất và người tiêu dùng. Tuy...

https://dev.to/terus_technique/thiet-ke-website-dai-ly-nha-phan-phoi-toi-uu-chi-phi-2343

website, digitalmarketing, seo, terus

 Đại lý và nhà phân phối đều là những đơn vị trung gian giữa nhà sản xuất và người tiêu dùng. Tuy nhiên, đại lý thường chỉ chuyên phân phối sản phẩm của một nhà sản xuất cụ thể, trong khi nhà phân phối có thể phân phối nhiều thương hiệu và sản phẩm khác nhau. Việc phân biệt rõ ràng giữa đại lý và nhà phân phối sẽ giúp các doanh nghiệp xác định được mục tiêu và chiến lược kinh doanh phù hợp. Những lợi ích của [thiết kế website đại lý, nhà phân phối](https://terusvn.com/thiet-ke-website-tai-hcm/) Các công cụ hỗ trợ trong công việc: Trang website đại lý/nhà phân phối cung cấp các công cụ như danh mục sản phẩm, công cụ tìm kiếm, hỗ trợ trực tuyến,... nhằm hỗ trợ công việc kinh doanh của đại lý/nhà phân phối. Mở rộng danh tiếng của thương hiệu: Với một trang web chuyên nghiệp, đại lý/nhà phân phối có thể nâng cao uy tín và hình ảnh của thương hiệu mà họ đại diện. Tiếp cận được nhiều khách hàng tiềm năng: Website đại lý/nhà phân phối có thể thu hút lượng lớn khách hàng online, mở rộng phạm vi tiếp cận so với bán hàng truyền thống. Tối ưu hóa chi phí quảng cáo: So với các hình thức quảng cáo truyền thống, website đại lý/nhà phân phối có thể giúp tiết kiệm chi phí quảng bá sản phẩm. Các yếu tố cần thiết khi thiết kế website đại lý/nhà phân phối Trang chủ: Trang chủ cần thu hút sự chú ý của khách hàng, cung cấp thông tin cơ bản về đại lý/nhà phân phối và sản phẩm. Giới thiệu: Giới thiệu về công ty, lịch sử hình thành, thế mạnh, đội ngũ... Tin tức: Cập nhật thông tin về sản phẩm mới, khuyến mãi, tin tức ngành... Danh mục sản phẩm: Trình bày đầy đủ thông tin về các sản phẩm. Thanh tìm kiếm: Giúp khách hàng tìm kiếm sản phẩm nhanh chóng. Hỗ trợ trực tuyến: Tư vấn, hỗ trợ khách hàng online. Liên hệ: Cung cấp thông tin liên hệ, địa chỉ, bản đồ... Với đội ngũ chuyên gia giàu kinh nghiệm, Terus tự hào cung cấp [dịch vụ thiết kế website đại lý/nhà phân phối chuyên nghiệp](https://terusvn.com/thiet-ke-website-tai-hcm/), đáp ứng nhu cầu kinh doanh của khách hàng. Quy trình thiết kế chi tiết và đảm bảo chất lượng sẽ mang lại những giải pháp website hiệu quả, nâng cao hiệu quả kinh doanh cho đại lý và nhà phân phối. Tìm hiểu thêm về [Thiết Kế Website Đại Lý, Nhà Phân Phối Tối Ưu Chi Phí](https://terusvn.com/thiet-ke-website/terus-thiet-ke-website-dai-ly/) Các dịch vụ tại Terus: Digital Marketing: · [Dịch vụ Facebook Ads](https://terusvn.com/digital-marketing/dich-vu-facebook-ads-tai-terus/) · [Dịch vụ Google Ads](https://terusvn.com/digital-marketing/dich-vu-quang-cao-google-tai-terus/) · [Dịch vụ SEO Tổng Thể](https://terusvn.com/seo/dich-vu-seo-tong-the-uy-tin-hieu-qua-tai-terus/) Thiết kế website: · [Dịch vụ Thiết kế website chuẩn Insight](https://terusvn.com/thiet-ke-website/dich-vu-thiet-ke-website-chuan-insight-chuyen-nghiep-uy-tin-tai-terus/) · [Dịch vụ Thiết kế website](https://terusvn.com/thiet-ke-website-tai-hcm/)

terus_technique

Thiết Kế Website Dịch Vụ Visa Hộ Chiếu Chất Lượng Cao

Thiết kế và sở hữu một website chuyên về dịch vụ visa mang lại nhiều lợi ích cho doanh nghiệp....

https://dev.to/terus_technique/thiet-ke-website-dich-vu-visa-ho-chieu-chat-luong-cao-5ap

website, digitalmarketing, seo, terus

 Thiết kế và sở hữu một website chuyên về dịch vụ visa mang lại nhiều lợi ích cho doanh nghiệp. Trước hết, nó tạo ấn tượng ban đầu tốt với khách hàng, thể hiện sự chuyên nghiệp và uy tín của công ty. Một website dịch vụ visa có thể giúp tiết kiệm thời gian và công sức khi khách hàng có thể tự tra cứu thông tin, điền đơn và gửi yêu cầu trực tuyến. Điều này mở rộng sự tương tác và phản hồi, giúp xây dựng niềm tin và sự tin tưởng với khách hàng. Một website dịch vụ visa cũng giúp tăng khả năng tiếp cận thị trường rộng hơn, đáp ứng nhu cầu của khách hàng tốt hơn. Điều này tạo ra sự khác biệt với các đối thủ cạnh tranh. Khi thiết kế website dịch vụ visa, cần chú ý đến các yếu tố sau: Giao diện website phải thu hút, dễ sử dụng và có tính chuyên nghiệp cao. Chức năng của website cần đa dạng, bao gồm trang chủ, mục dịch vụ, bài viết/tin tức, tư vấn và hỏi đáp, liên hệ, liên kết mạng xã hội. Đảm bảo chất lượng hosting, tốc độ tải trang nhanh. Tích hợp hỗ trợ trên điện thoại di động. Tối ưu hóa SEO để website dễ tìm kiếm hơn. Thiết kế URL ngắn gọn, dễ nhớ. Terus cung cấp [dịch vụ thiết kế website dịch vụ visa chuyên nghiệp, uy tín](https://terusvn.com/thiet-ke-website-tai-hcm/) với quy trình gồm 6 bước chính: Nhận yêu cầu và tư vấn Thiết kế bản website dịch vụ visa demo Hoàn thiện giao diện và triển khai tính năng Tối ưu các chỉ mục chuẩn Insight của Terus Chạy thử sản phẩm, hoàn thiện Bàn giao và hướng dẫn Với đội ngũ chuyên gia, công nghệ hiện đại và cam kết chất lượng, Terus tự tin mang đến những [website dịch vụ visa chuyên nghiệp, ấn tượng](https://terusvn.com/thiet-ke-website-tai-hcm/) và hiệu quả, góp phần nâng cao vị thế và lợi thế cạnh tranh cho doanh nghiệp. Tìm hiểu thêm về [Thiết Kế Website Dịch Vụ Visa Hộ Chiếu Chất Lượng Cao](https://terusvn.com/thiet-ke-website/terus-thiet-ke-website-dich-vu-visa/) Các dịch vụ tại Terus: Digital Marketing: · [Dịch vụ Facebook Ads](https://terusvn.com/digital-marketing/dich-vu-facebook-ads-tai-terus/) · [Dịch vụ Google Ads](https://terusvn.com/digital-marketing/dich-vu-quang-cao-google-tai-terus/) · [Dịch vụ SEO Tổng Thể](https://terusvn.com/seo/dich-vu-seo-tong-the-uy-tin-hieu-qua-tai-terus/) Thiết kế website: · [Dịch vụ Thiết kế website chuẩn Insight](https://terusvn.com/thiet-ke-website/dich-vu-thiet-ke-website-chuan-insight-chuyen-nghiep-uy-tin-tai-terus/) · [Dịch vụ Thiết kế website](https://terusvn.com/thiet-ke-website-tai-hcm/)

terus_technique

Dependency Injection in .NET with Microsoft.Extensions.DependencyInjection and Scrutor

Dependency Injection (DI) is a crucial design pattern in modern software development that enables the...

https://dev.to/adrianbailador/dependency-injection-in-net-with-microsoftextensionsdependencyinjection-and-scrutor-49pc

webdev, dotnet, csharp, programming

**Dependency Injection** (DI) is a crucial design pattern in modern software development that enables the construction of more flexible, maintainable, and testable applications. In the .NET ecosystem, **Microsoft.Extensions.DependencyInjection** is the official implementation of this pattern, while **Scrutor** extends its capabilities, further facilitating service registration. In this article, we will explore both topics with practical examples. ## **1. What is Dependency Injection?** Dependency Injection (DI) is a technique that promotes the separation of concerns and facilitates the management of dependencies between application components. With DI, a component does not create its dependencies directly but receives them from a dependency injection container. ### **Advantages of DI**: - **Maintainability**: Eases the change and update of dependencies. - **Testability**: Simplifies the creation of unit tests using mocks and stubs. - **Flexibility**: Allows for implementation changes without modifying the consumers. ## **2. Microsoft.Extensions.DependencyInjection** `Microsoft.Extensions.DependencyInjection` is the DI tool provided by Microsoft for .NET, included by default in .NET Core and .NET 5+. ### **2.1 Basic Configuration** To start, add the `Microsoft.Extensions.DependencyInjection` package if it is not already included in your project: ```sh dotnet add package Microsoft.Extensions.DependencyInjection ``` ### **2.2 Basic Example** Suppose we have an `IMyService` interface and its implementation `MyService`. ```csharp public interface IMyService { void DoWork(); } public class MyService : IMyService { public void DoWork() { Console.WriteLine("Work done, Codú!"); } } ``` To configure DI: 1. Create a `ServiceCollection` and register the services. 2. Build a `ServiceProvider`. 3. Use the `ServiceProvider` to resolve and utilise the dependencies. ```csharp using Microsoft.Extensions.DependencyInjection; using System; class Program { static void Main(string[] args) { // Create a ServiceCollection var serviceCollection = new ServiceCollection(); // Register services serviceCollection.AddTransient<IMyService, MyService>(); // Build the ServiceProvider var serviceProvider = serviceCollection.BuildServiceProvider(); // Resolve and use the service var myService = serviceProvider.GetService<IMyService>(); myService.DoWork(); } } ``` ### **2.3 Service Lifetimes** When registering services, you can specify different lifetimes: - **Transient**: A new instance is created each time the service is requested. - **Scoped**: A new instance is created per scope, useful in web applications where each HTTP request can have its own scope. - **Singleton**: A single instance is created and shared throughout the application. ```csharp serviceCollection.AddTransient<IMyService, MyService>(); // Transient serviceCollection.AddScoped<IMyService, MyService>(); // Scoped serviceCollection.AddSingleton<IMyService, MyService>(); // Singleton ``` ## **3. Scrutor** **Scrutor** is a library that extends `Microsoft.Extensions.DependencyInjection` and facilitates the automatic registration of services. ### **3.1 Installing Scrutor** Add the Scrutor package using NuGet: ```sh dotnet add package Scrutor ``` ### **3.2 Example with Scrutor** Suppose we have several services and want to register them automatically. Scrutor makes this easy. ```csharp using Microsoft.Extensions.DependencyInjection; using Scrutor; using System; public interface IServiceA { void DoA(); } public class ServiceA : IServiceA { public void DoA() { Console.WriteLine("ServiceA executing DoA"); } } public interface IServiceB { void DoB(); } public class ServiceB : IServiceB { public void DoB() { Console.WriteLine("ServiceB executing DoB"); } } class Program { static void Main(string[] args) { // Create a ServiceCollection var serviceCollection = new ServiceCollection(); // Register services automatically serviceCollection.Scan(scan => scan .FromAssemblyOf<IServiceA>() .AddClasses(classes => classes.AssignableTo<IServiceA>()) .AsImplementedInterfaces() .WithTransientLifetime() .AddClasses(classes => classes.AssignableTo<IServiceB>()) .AsImplementedInterfaces() .WithTransientLifetime() ); // Build the ServiceProvider var serviceProvider = serviceCollection.BuildServiceProvider(); // Resolve and use the services var serviceA = serviceProvider.GetService<IServiceA>(); serviceA.DoA(); var serviceB = serviceProvider.GetService<IServiceB>(); serviceB.DoB(); } } ``` ### **3.3 Conditional Registration** Scrutor allows for more complex rules when registering services. ```csharp serviceCollection.Scan(scan => scan .FromAssemblyOf<IServiceA>() .AddClasses(classes => classes.Where(type => type.Name.EndsWith("Service"))) .AsImplementedInterfaces() .WithScopedLifetime() ); ``` In this example, only classes whose names end with "Service" will be registered and will have a scoped lifetime. ## **Conclusion** Dependency injection is a powerful technique that, when used correctly, can improve the structure and maintainability of .NET applications. `Microsoft.Extensions.DependencyInjection` provides a solid foundation for DI, while `Scrutor` adds an extra layer of flexibility and convenience, allowing for automatic and conditional registration of services. For more information, check out the [official Microsoft documentation](https://docs.microsoft.com/dotnet/core/extensions/dependency-injection) and the [Scrutor documentation](https://github.com/khellang/Scrutor).

adrianbailador

Creating a Product Card with Cart Items

Welcome to codeswithpankaj.com! In this tutorial, we will create an interactive product card with...

https://dev.to/codeswithpankaj/creating-a-product-card-with-cart-items-299e

webdev, javascript, beginners, tutorial

Welcome to codeswithpankaj.com! In this tutorial, we will create an interactive product card with cart items using HTML and CSS. This card will have a hover effect that flips the card to reveal more details. ### Step 1: HTML Structure First, we will set up the basic HTML structure for our product card. Create an HTML file and add the following code: ```html <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Product Card with Cart Items</title> <link rel="stylesheet" href="styles.css"> </head> <body> <div class="card"> <div class="card-inner"> <div class="card-front"> <img src="shoe.png" alt="Nike Air"> <h3>Nike Air (Women)<br>Size 7</h3> <p>Price £199.99</p> <button>Add to basket</button> </div> <div class="card-back"> <img src="shoe.png" alt="Nike Air"> <h3>Details about the product</h3> <p>More info about Nike Air</p> <button>View More</button> </div> </div> </div> </body> </html> ``` ### Step 2: CSS Styling Next, we will style our product card to add the flipping effect. Create a CSS file named `styles.css` and add the following code: ```css body { display: flex; justify-content: center; align-items: center; height: 100vh; background-color: #000; color: #fff; font-family: Arial, sans-serif; } .card { perspective: 1000px; } .card-inner { position: relative; width: 300px; height: 400px; text-align: center; transition: transform 0.6s; transform-style: preserve-3d; } .card:hover .card-inner { transform: rotateY(180deg); } .card-front, .card-back { position: absolute; width: 100%; height: 100%; backface-visibility: hidden; border-radius: 16px; } .card-front { background: linear-gradient(45deg, #00c6ff, #0072ff); } .card-back { background: linear-gradient(45deg, #ff416c, #ff4b2b); transform: rotateY(180deg); } .card img { width: 100px; margin-top: 20px; } h3, p { margin: 10px 0; } button { margin-top: 20px; padding: 10px 20px; border: none; border-radius: 20px; background: #fff; color: #000; cursor: pointer; transition: background 0.3s; } button:hover { background: #ddd; } ``` ### Step 3: Adding Multiple Cards To add multiple cards, simply duplicate the card `div` in the HTML file and update the details accordingly. Here's an example with three cards: ```html <div class="card-container"> <div class="card"> <div class="card-inner"> <div class="card-front"> <img src="shoe.png" alt="Nike Air"> <h3>Nike Air (Women)<br>Size 7</h3> <p>Price £199.99</p> <button>Add to basket</button> </div> <div class="card-back"> <img src="shoe.png" alt="Nike Air"> <h3>Details about the product</h3> <p>More info about Nike Air</p> <button>View More</button> </div> </div> </div> <div class="card"> <div class="card-inner"> <div class="card-front"> <img src="shoe.png" alt="Nike Air"> <h3>Nike Air (Men)<br>Size 10</h3> <p>Price £99.99</p> <button>Add to basket</button> </div> <div class="card-back"> <img src="shoe.png" alt="Nike Air"> <h3>Details about the product</h3> <p>More info about Nike Air</p> <button>View More</button> </div> </div> </div> <div class="card"> <div class="card-inner"> <div class="card-front"> <img src="shoe.png" alt="Nike Air"> <h3>Nike Air (Women)<br>Size 8</h3> <p>Price £399.99</p> <button>Add to basket</button> </div> <div class="card-back"> <img src="shoe.png" alt="Nike Air"> <h3>Details about the product</h3> <p>More info about Nike Air</p> <button>View More</button> </div> </div> </div> </div> ``` And update the CSS to center the cards: ```css .card-container { display: flex; gap: 20px; } ``` ### Conclusion You've now created a stylish product card with a flip effect that shows additional information on hover. This tutorial covered the basics of HTML and CSS to achieve this effect. Feel free to customize the design and functionality to fit your needs. Happy coding! --- For more tutorials and coding tips, visit [codeswithpankaj.com](https://codeswithpankaj.com)

codeswithpankaj

Redux : State Management Tool

Hello! Today, we are going to explore how to manage state in production-ready projects using Redux....

https://dev.to/achal_tiwari/redux-state-management-tool-4242

webdev, redux, beginners, react

Hello! Today, we are going to explore how to manage state in production-ready projects using Redux. For those who aren't familiar with state management, let's break it down. ##### What is State Management? State management is about handling the state of various user interface elements, such as text fields, buttons, and other interactive components in a graphical user interface. To get a clearer understanding of state management and React, check out the Context API. You can read the official docs or my [article](https://achaltiwari.hashnode.dev/context-api) on it. ##### What is Redux? Redux is a pattern and library for managing and updating application state, using events called "actions". - It serves as a centralized store for state that needs to be used across your entire application, with rules ensuring that the state can only be updated in a predictable fashion. ###### Key Concepts of Redux Store: The store holds the [state](https://react.dev/learn/state-a-components-memory) of your application. Actions: Actions are plain JavaScript objects that describe what happened. Reducers: Reducers specify how the application's state changes in response to actions.  #### Setting Up Redux in a React App Let's start by setting up Redux in a simple React app. ```bash npx create-react-app my-redux-app cd my-redux-app npm install redux react-redux ``` #### Set Up the Redux Store Create a store.js file: ```javascript import { createStore } from 'redux'; // Initial state const initialState = { count: 0, }; // Reducer const reducer = (state = initialState, action) => { switch (action.type) { case 'INCREMENT': return { ...state, count: state.count + 1 }; case 'DECREMENT': return { ...state, count: state.count - 1 }; default: return state; } }; // Create store const store = createStore(reducer); export default store; ``` #### Provide the Store to Your App Wrap your app with the Provider component from react-redux in index.js: ```javascript import React from 'react'; import ReactDOM from 'react-dom'; import { Provider } from 'react-redux'; import store from './store'; import App from './App'; ReactDOM.render( // this wrap helps all your components to get access of your store <Provider store={store}> <App /> </Provider>, document.getElementById('root') ); ``` #### Connect Components to Redux Create a Counter.js component: ```javascript import React from 'react'; import { useSelector, useDispatch } from 'react-redux'; const Counter = () => { //Selector helps you to get access of data based on provided state const count = useSelector(state => state.count); // useDispatch allows React components to dispatch actions to the // Redux store. const dispatch = useDispatch(); return ( <div> <h1>Count: {count}</h1> // we have made switch cases based on action type, therefore we // need to pass type along with dispatch <button onClick={() => dispatch({ type: 'INCREMENT' })}>Increment</button> <button onClick={() => dispatch({ type: 'DECREMENT' })}>Decrement</button> </div> ); }; export default Counter; ``` Add the Counter component to your App.js: ```javascript import React from 'react'; import Counter from './Counter'; function App() { return ( <div className="App"> <Counter /> </div> ); } export default App; ``` Now, this approach is a bit complex, but it's essential to understand the fundamentals of Redux and how it works. In the second part, we'll simplify things by using redux-toolkit. Let's dive into the easier way of managing state with Redux Toolkit! #### 1. Install Redux Toolkit ```bash npm install @reduxjs/toolkit ``` #### 2. Set up the store with Redux Toolkit Update your store.js file ```javascript import { configureStore, createSlice } from '@reduxjs/toolkit'; //A slice is a collection of actions and reducer logic for a single feature in an app // Create a slice const counterSlice = createSlice({ name: 'counter', initialState: { count: 0 }, reducers: { increment: state => { state.count += 1; }, decrement: state => { state.count -= 1; }, }, }); // Export actions export const { increment, decrement } = counterSlice.actions; // Create store const store = configureStore({ reducer: counterSlice.reducer, }); export default store; ``` #### 3. Update the Component Update the Counter.js ```javascript import React from 'react'; import { useSelector, useDispatch } from 'react-redux'; import { increment, decrement } from './store'; const Counter = () => { const count = useSelector(state => state.count); const dispatch = useDispatch(); return ( <div> <h1>Count: {count}</h1> <button onClick={() => dispatch(increment())}>Increment</button> <button onClick={() => dispatch(decrement())}>Decrement</button> </div> ); }; export default Counter; ``` This is it, you are done, now go and make real world application to have practice with redux. Happy Coding!

achal_tiwari

Step-by-Step Guide to Creating a CSS Carousel

A CSS-only carousel can be an elegant and performant way to showcase images or content. This guide...

https://dev.to/mdhassanpatwary/step-by-step-guide-to-creating-a-css-carousel-g7k

webdev, css, programming, productivity

A CSS-only carousel can be an elegant and performant way to showcase images or content. This guide explains how to create a simple, yet effective carousel using only HTML and CSS. ## Working Demo You can view and interact with the working demo on JSFiddle: [CSS Carousel Demo](https://jsfiddle.net/mdhasanpatwary/ckrvuzn2/) ## HTML Structure The HTML structure consists of an article element that acts as a wrapper. Inside this wrapper, there's a container div followed by a row div, and within it, the slideshow div contains the list of slides. ``` <article id="top" class="wrapper style1"> <div class="container"> <div class="row"> <div class="slideshow"> <ul class="baner"> <li><span>SKUP AUT SPRAWNYCH I USZKODZONYCH <br>GOTÓWKA DO RĘKI</span></li> <li><span>SKUP AUT POZNAŃ I WIELKOPOLSKA <br>ZADZWOŃ</span></li> <li><span>SKUP AUT SPRAWNYCH I <br>USZKODZONYCH - GOTÓWKA DO RĘKI</span></li> </ul> </div> </div> </div> </article> ``` ## CSS Styling **Slideshow Container** The `.slideshow` class centers the slideshow, sets its maximum width, and makes it responsive. ``` .slideshow { margin: 0px auto; max-width: 1920px; width: 100%; height: 450px; text-align: center; position: relative; } ``` **Banner Styling** The `.baner` class positions the list absolutely within the slideshow container. ``` .baner { position: absolute; padding-left: 0; width: 100%; height: 450px; top: 50px; left: 0; right: 0; } ``` The list items have no default list styling. ``` .baner li { list-style: none; } ``` **Slide Styling** The span elements inside the list items are styled to cover the entire slide area, and are positioned absolutely. ``` .baner li span { padding-top: 180px; font-size: 40px; position: absolute; width: 100%; height: 100%; top: 0; left: 0; color: white; font-weight: 400; text-align: left; letter-spacing: 4px; font-family: open-sans, sans-serif; background-size: cover; background-position: 50% 50%; opacity: 0; z-index: 2; animation: imageAnimation 15s ease infinite 0s; } ``` **Overlay** A pseudo-element is used to create a dark overlay over the text. ``` .baner li span::after { content: ""; background-color: #00000066; width: 50%; height: 25%; top: 170px; position: absolute; left: 0px; z-index: -1; } ``` **Background Images and Animation Delay** Each slide is given a background image and a different animation delay to create the slideshow effect. ``` .baner li:nth-child(1) span { background-image : url(https://images.pexels.com/photos/19964831/pexels-photo-19964831/free-photo-of-blue-heron.jpeg?auto=compress&cs=tinysrgb&w=600&lazy=load); } .baner li:nth-child(2) span { background-image: url(https://images.pexels.com/photos/12489311/pexels-photo-12489311.jpeg?auto=compress&cs=tinysrgb&w=600&lazy=load); animation-delay: 5s; } .baner li:nth-child(3) span { background-image : url(https://images.pexels.com/photos/20744632/pexels-photo-20744632/free-photo-of-a-church-sits-on-top-of-a-hill-overlooking-a-valley.jpeg?auto=compress&cs=tinysrgb&w=600&lazy=load); animation-delay: 10s; } ``` **Keyframes Animation** The `@keyframes` rule defines the fade-in and fade-out animation for the slides. ``` @keyframes imageAnimation { 0% { opacity: 0; } 13% { opacity: 1; } 25% { opacity: 1; } 37% { opacity: 0; } 100% { opacity: 0; } } ``` ## Explanation **1. Structure and Layout:** The HTML sets up the basic structure for the carousel. The CSS ensures the slideshow is centered and takes up the full width of its container. **2. Positioning and Styling:** Each slide is absolutely positioned to occupy the full space of the container. The pseudo-element adds a semi-transparent overlay to improve text readability. **3. Background and Animation:** Each slide is assigned a background image. The animation delay staggers the appearance of each slide, creating a seamless transition. **4. Keyframes Animation:** The keyframes animation handles the opacity changes, making each slide fade in and out at the specified intervals. ## Conclusion This guide covers the basics of creating a CSS-only carousel. By understanding the HTML structure and CSS animations, you can build and customize your carousel to suit various needs. The working demo provides a practical example that you can explore and modify.

mdhassanpatwary

Thiết Kế Website Máy Cắt Kim Loại Tối Ưu Hiệu Quả

Một website không chỉ là công cụ hiệu quả để xây dựng thương hiệu và hình ảnh doanh nghiệp, mà còn...

https://dev.to/terus_technique/thiet-ke-website-may-cat-kim-loai-toi-uu-hieu-qua-419n

website, digitalmarketing, seo, terus

 Một website không chỉ là công cụ hiệu quả để xây dựng thương hiệu và hình ảnh doanh nghiệp, mà còn là cầu nối và kênh giao tiếp trực tuyến với khách hàng tiềm năng. Một website máy cắt kim loại CNC chuyên nghiệp sẽ giúp doanh nghiệp: Xây dựng hình ảnh chuyên nghiệp và hiệu quả: Với giao diện hiện đại, dễ dàng điều hướng và đầy đủ thông tin, website sẽ truyền tải một hình ảnh tổ chức khoa học và chuyên nghiệp về doanh nghiệp. Tạo dựng bộ mặt kinh doanh online: Trong thời đại số hóa, website chính là cửa ngõ đầu tiên để khách hàng tiếp cận và tìm hiểu về doanh nghiệp. Một website ấn tượng và chuyên nghiệp sẽ tạo ấn tượng tốt về thương hiệu. Công cụ cạnh tranh và truyền thông hiệu quả: Website không chỉ là công cụ để tiếp cận và thu hút khách hàng mà còn là kênh truyền thông hiệu quả, giúp doanh nghiệp nâng cao tính cạnh tranh trong ngành. Tiết kiệm chi phí, hỗ trợ kinh doanh: Với chi phí vận hành và quản lý thấp, website sẽ trở thành công cụ hỗ trợ hiệu quả cho hoạt động kinh doanh, giúp doanh nghiệp tiết kiệm chi phí và tăng hiệu quả. Dễ dàng tùy biến và thỏa mãn khách hàng: Website có thể dễ dàng được thiết kế và cập nhật để phù hợp với nhu cầu khách hàng, giúp doanh nghiệp chủ động trong việc đáp ứng và thỏa mãn khách hàng. Terus - công ty thiết kế website chuyên nghiệp - cung cấp [dịch vụ thiết kế website máy cắt kim loại CNC trọn gói](https://terusvn.com/thiet-ke-website-tai-hcm/), đáp ứng mọi nhu cầu của doanh nghiệp. Với quy trình thiết kế 6 bước từ lắng nghe yêu cầu đến bàn giao sản phẩm, Terus cam kết mang đến những website máy cắt kim loại CNC chuyên nghiệp, ấn tượng và hiệu quả. Với [dịch vụ thiết kế website máy cắt kim loại CNC](https://terusvn.com/thiet-ke-website-tai-hcm/) tại Terus, doanh nghiệp sẽ sở hữu những website chuyên nghiệp, hiệu quả và thỏa mãn các yêu cầu kinh doanh. Tìm hiểu thêm về Thiết Kế Website Máy Cắt Kim Loại Tối Ưu Hiệu Quả Digital Marketing: · [Dịch vụ Facebook Ads](https://terusvn.com/digital-marketing/dich-vu-facebook-ads-tai-terus/) · [Dịch vụ Google Ads](https://terusvn.com/digital-marketing/dich-vu-quang-cao-google-tai-terus/) · [Dịch vụ SEO Tổng Thể](https://terusvn.com/seo/dich-vu-seo-tong-the-uy-tin-hieu-qua-tai-terus/) Thiết kế website: · [Dịch vụ Thiết kế website chuẩn Insight](https://terusvn.com/thiet-ke-website/dich-vu-thiet-ke-website-chuan-insight-chuyen-nghiep-uy-tin-tai-terus/) · [Dịch vụ Thiết kế website](https://terusvn.com/thiet-ke-website-tai-hcm/)

terus_technique

Domain Name System (DNS) for Beginners

Whenever you visit any website on your computer or mobile device you type in the name of that website...

https://dev.to/syedumaircodes/domain-name-system-dns-for-beginners-dec

webdev, beginners, learning, networking

Whenever you visit any website on your computer or mobile device you type in the name of that website in your web browser and the browser loads up the website. The browser actually has to communicate with other computers and servers in order to find the website that you want to visit in order to load the requested website. > These computers can be located in the same building, same area, same country or even across the globe. In order for the browser to load up a website it has to communicate with the servers that could know where the website is located and it does that by using a domain name system. The DNS takes the domain of the website and turns it into a number that is known as an IP address and each domain that is currently active on the internet is mapped to its own IP address. The DNS is a mapper that maps all the domains to their IP addresses and every device that can connect to the internet has a built in IP resolver so it can resolve the domain it should connect to when you want to visit a website. Most of the times your internet service provider or ISP is the one that resolves the IP addresses for you but you can do it manually as well if you want. A DNS resolver is a software is the software that your computer connects to when it doesn't know the IP address of the domain you want to visit to. If the DNS resolver doesn't know the IP address of the domain it will ask other DNS resolvers about the domain and when the domain if found by one of the IP resolvers, your IP resolver will tell your computer that the domain that you want to visit is at this IP address and your computer will load the website and the DNS resolver will then cache the domain for future reference. > 1.1.1.1 is a popular DNS resolver from Cloudflare. ---- I hope you liked this simple and beginner freidnly introduction to Domain Name Systems, if you have any questions please feel free to ask them in comments below. You can follow me on Twitter(X), Linkedin, and GitHub @SyedUmairCodes.

syedumaircodes

Thiết Kế Website Trung Tâm Thương Mại Đa Dạng Chức Năng

Việc sở hữu một website hiện đại và chuyên nghiệp trở nên vô cùng quan trọng đối với các trung tâm...

https://dev.to/terus_technique/thiet-ke-website-trung-tam-thuong-mai-da-dang-chuc-nang-1h0m

website, digitalmarketing, seo, terus

 Việc sở hữu một [website hiện đại và chuyên nghiệp](https://terusvn.com/thiet-ke-website-tai-hcm/) trở nên vô cùng quan trọng đối với các trung tâm thương mại, siêu thị và shopping mall. Một website được thiết kế tốt không chỉ là cổng thông tin kết nối với khách hàng mà còn mang lại nhiều lợi ích khác cho doanh nghiệp. Trước hết, website của trung tâm thương mại, siêu thị và shopping mall cần có những tính năng cơ bản như: Cổng thông tin kết nối với khách hàng: Website là nơi cung cấp đầy đủ thông tin về doanh nghiệp, các thương hiệu, cửa hàng, khuyến mãi, sự kiện,... để khách hàng dễ dàng tiếp cận. Mua sắm trực tuyến: Khách hàng có thể thoải mái mua sắm các sản phẩm mà không cần phải đến trực tiếp tại cửa hàng. Giao diện dễ sử dụng: Giao diện website phải đơn giản, direct và thu hút khách hàng. Tốc độ tải trang nhanh: Để mang lại trải nghiệm tốt nhất cho người dùng. Bên cạnh đó, việc thiết kế website trung tâm thương mại, siêu thị và shopping mall còn mang lại nhiều lợi ích cho doanh nghiệp như: Thu hút các thương hiệu nổi tiếng: Một website chuyên nghiệp sẽ góp phần thu hút các thương hiệu lớn đặt cửa hàng tại trung tâm. Kênh truyền thông hiệu quả: Website sẽ là kênh truyền thông chính để doanh nghiệp tương tác với khách hàng, quảng bá sản phẩm/dịch vụ. Cải thiện vị trí trên các công cụ tìm kiếm: Với những tối ưu về SEO, doanh nghiệp sẽ dễ dàng lọt top tìm kiếm. Xây dựng thương hiệu và tạo khoảng cách với đối thủ: Một website chất lượng sẽ giúp doanh nghiệp khẳng định vị thế và tạo sự khác biệt. Terus - công ty thiết kế website chuyên nghiệp - đã và đang cung cấp dịch vụ thiết kế website trung tâm thương mại, siêu thị và shopping mall, đáp ứng các tiêu chuẩn về giao diện, tính năng và tối ưu SEO. Với quy trình thiết kế 6 bước từ khâu tư vấn đến bàn giao, Terus cam kết mang lại những [giải pháp website đạt chuẩn "Insight"](https://terusvn.com/thiet-ke-website-tai-hcm/) và mang lại nhiều lợi ích cho doanh nghiệp. Việc sở hữu một website chuyên nghiệp và uy tín là điều cần thiết đối với các trung tâm thương mại, siêu thị và shopping mall trong bối cảnh cạnh tranh ngày càng gay gắt. Nó không chỉ là kênh truyền thông hiệu quả mà còn là công cụ để doanh nghiệp nâng cao vị thế, thu hút khách hàng và khẳng định thương hiệu. Tìm hiểu thêm về [Thiết Kế Website Trung Tâm Thương Mại Đa Dạng Chức Năng](https://terusvn.com/thiet-ke-website/thiet-ke-website-trung-tam-thuong-mai/) Digital Marketing: · [Dịch vụ Facebook Ads](https://terusvn.com/digital-marketing/dich-vu-facebook-ads-tai-terus/) · [Dịch vụ Google Ads](https://terusvn.com/digital-marketing/dich-vu-quang-cao-google-tai-terus/) · [Dịch vụ SEO Tổng Thể](https://terusvn.com/seo/dich-vu-seo-tong-the-uy-tin-hieu-qua-tai-terus/) Thiết kế website: · [Dịch vụ Thiết kế website chuẩn Insight](https://terusvn.com/thiet-ke-website/dich-vu-thiet-ke-website-chuan-insight-chuyen-nghiep-uy-tin-tai-terus/) · [Dịch vụ Thiết kế website](https://terusvn.com/thiet-ke-website-tai-hcm/)

terus_technique

Freeware: Java Utility Package (Version 2024.07.07) released

The new release 2024.07.07 of the Java Utility Package ch.k43.util has been...

https://dev.to/andybrunner/freeware-java-utility-package-version-20240707-released-g4n

freeware, java, programming, jdbc

The new release 2024.07.07 of the Java Utility Package ch.k43.util has been released. https://java-util.k43.ch

andybrunner

Free Image hosting solution for your website

Professional Free Image Hosting Platform: Pics Shade Overview Pics Shade is a...

https://dev.to/sh20raj/pics-shade-image-hosting-solution-for-your-website-3h8g

image, hosting, pics, shade

### Professional Free Image Hosting Platform: Pics Shade #### Overview Pics Shade is a comprehensive image hosting solution designed for both individuals and businesses. It offers an intuitive platform for uploading, managing, and delivering images with a focus on ease of integration and scalability. #### Key Features - **Freemium Model**: Start for free with up to 10,000 images. - **API Key-based Uploads**: Seamlessly integrate with your application using API key authentication. - **CDN Delivery**: Serve images quickly and reliably through a global CDN. - **Image Management**: Organize images with tags and folders for efficient management. - **Advanced Integrations**: Includes support for S3 storage and Cloudinary CDN, along with free image resizing. #### Pricing Model 1. **Free Plan**: - Up to 10,000 images - API key-based uploads - CDN delivery - Image management - Free image resizing 2. **Pro Plan** ($10 per 10,000 additional images): - 10,000 additional images - Enhanced features including Cloudinary CDN integration 3. **Enterprise Plan** (Custom Pricing): - Unlimited images - Custom features and dedicated support For more details on pricing and features, visit the [Pics Shade Pricing Page](https://pics.shade.cool/). #### API Upload Documentation To upload an image via the API: - **Endpoint**: `POST /upload` - **Headers**: Include `Authorization: Bearer YOUR_API_KEY` - **Body Parameters**: - `file`: The image file to be uploaded - `tags`: Optional tags for organizing the image - `folder`: Optional folder name to categorize the image ##### Sample Code in Python ```python import requests url = "https://api.pics.shade.cool/upload" headers = { "Authorization": "Bearer YOUR_API_KEY" } files = { "file": open("path/to/your/image.jpg", "rb") } data = { "tags": "example, sample", "folder": "my_images" } response = requests.post(url, headers=headers, files=files, data=data) print(response.json()) ``` ##### Sample Code in JavaScript (Node.js) ```javascript const axios = require('axios'); const FormData = require('form-data'); const fs = require('fs'); const url = 'https://api.pics.shade.cool/upload'; const form = new FormData(); form.append('file', fs.createReadStream('path/to/your/image.jpg')); form.append('tags', 'example, sample'); form.append('folder', 'my_images'); axios.post(url, form, { headers: { 'Authorization': `Bearer YOUR_API_KEY`, ...form.getHeaders() } }) .then(response => { console.log(response.data); }) .catch(error => { console.error(error); }); ``` For a detailed guide, refer to the [Pics Shade API Upload Documentation](https://docs.pics.shade.cool/api-reference/upload-image). Pics Shade provides a robust and scalable solution for all your image hosting needs, combining ease of use with powerful features to ensure your images are managed and delivered efficiently.

sh20raj

Professional Free Image Hosting Platform: Pics Shade

Professional Free Image Hosting Platform: Pics Shade Overview Pics Shade is a...

https://dev.to/sh20raj/professional-free-image-hosting-platform-pics-shade-417o

pics, image, hosting, shade

### Professional Free Image Hosting Platform: Pics Shade #### Overview Pics Shade is a comprehensive image hosting solution designed for both individuals and businesses. It offers an intuitive platform for uploading, managing, and delivering images with a focus on ease of integration and scalability. #### Key Features - **Freemium Model**: Start for free with up to 10,000 images. - **API Key-based Uploads**: Seamlessly integrate with your application using API key authentication. - **CDN Delivery**: Serve images quickly and reliably through a global CDN. - **Image Management**: Organize images with tags and folders for efficient management. - **Advanced Integrations**: Includes support for S3 storage and Cloudinary CDN, along with free image resizing. #### Pricing Model 1. **Free Plan**: - Up to 10,000 images - API key-based uploads - CDN delivery - Image management - Free image resizing 2. **Pro Plan** ($10 per 10,000 additional images): - 10,000 additional images - Enhanced features including Cloudinary CDN integration 3. **Enterprise Plan** (Custom Pricing): - Unlimited images - Custom features and dedicated support For more details on pricing and features, visit the [Pics Shade Pricing Page](https://pics.shade.cool/). #### API Upload Documentation To upload an image via the API: - **Endpoint**: `POST /upload` - **Headers**: Include `Authorization: Bearer YOUR_API_KEY` - **Body Parameters**: - `file`: The image file to be uploaded - `tags`: Optional tags for organizing the image - `folder`: Optional folder name to categorize the image ##### Sample Code in Python ```python import requests url = "https://api.pics.shade.cool/upload" headers = { "Authorization": "Bearer YOUR_API_KEY" } files = { "file": open("path/to/your/image.jpg", "rb") } data = { "tags": "example, sample", "folder": "my_images" } response = requests.post(url, headers=headers, files=files, data=data) print(response.json()) ``` ##### Sample Code in JavaScript (Node.js) ```javascript const axios = require('axios'); const FormData = require('form-data'); const fs = require('fs'); const url = 'https://api.pics.shade.cool/upload'; const form = new FormData(); form.append('file', fs.createReadStream('path/to/your/image.jpg')); form.append('tags', 'example, sample'); form.append('folder', 'my_images'); axios.post(url, form, { headers: { 'Authorization': `Bearer YOUR_API_KEY`, ...form.getHeaders() } }) .then(response => { console.log(response.data); }) .catch(error => { console.error(error); }); ``` For a detailed guide, refer to the [Pics Shade API Upload Documentation](https://docs.pics.shade.cool/api-reference/upload-image). Pics Shade provides a robust and scalable solution for all your image hosting needs, combining ease of use with powerful features to ensure your images are managed and delivered efficiently.

sh20raj

HIRING A QUALIFIED CRYPTO RECOVERY SPECIALIST - TREK TECH CORP

When a hacker managed to infiltrate my digital wallet and make off with over $568,000.00 dollars'...

https://dev.to/theo_finlayamelia_d0af7b/hiring-a-qualified-crypto-recovery-specialist-trek-tech-corp-p8d

bitcoin, cryptocurrency

When a hacker managed to infiltrate my digital wallet and make off with over $568,000.00 dollars' worth of my hard-earned Bitcoin, I was devastated. As a seasoned crypto investor, I thought I had taken all the necessary precautions to secure my digital assets, but this skilled cybercriminal had found a vulnerability and exploited it. I was left feeling violated and powerless, unsure if I would ever see my funds again. However, I refused to simply accept defeat. Determined to recover what was rightfully mine, I sought out the help of a renowned "crypto hacker” called TREK TECH CORP - an expert in the arcane world of blockchain technology who had a reputation for successfully tracking down and retrieving stolen digital currency. After a thorough investigation, this digital forensics specialist was able to trace the stolen Bitcoin to a dark web marketplace, where the hacker had attempted to launder the funds. Leveraging his deep understanding of cryptocurrency protocols and his extensive network of contacts in the underbelly of the digital economy, TREK TECH CORP was able to intercept the transaction and freeze the illicit funds before they could be withdrawn. It was a delicate and high-stakes operation, requiring precision timing and an encyclopedic knowledge of the ever-evolving tactics used by crypto thieves. But in the end, TREK TECH CORP skill and tenacity paid off, and I was overjoyed to have my $568,000.00 dollars' worth of Bitcoin safely returned to my control. This hard-won victory not only restored my financial security, but also reinforced my faith in the power of technological expertise to overcome even the most sophisticated criminal schemes. Do talk to TREK TECH CORP for assistance through email: [email protected] / [email protected] 

theo_finlayamelia_d0af7b

Website Bằng Laravel Là Gì? Lợi Ích Và Vai Trò

Laravel là một framework PHP mạnh mẽ và đáng tin cậy, được sử dụng ngày càng phổ biến để thiết kế và...

https://dev.to/terus_technique/website-bang-laravel-la-gi-loi-ich-va-vai-tro-3ndp

website, digitalmarketing, seo, terus

 Laravel là một framework PHP mạnh mẽ và đáng tin cậy, được sử dụng ngày càng phổ biến để thiết kế và xây dựng các website và ứng dụng web hiện đại. Nó cung cấp một cấu trúc rõ ràng và mạnh mẽ, giúp các nhà phát triển tạo ra các ứng dụng web với tính năng và chức năng tiên tiến. Đầu tiên, Laravel là một framework vững chắc và đáng tin cậy, cung cấp một nền tảng vững chắc để xây dựng các ứng dụng web phức tạp. Nó cung cấp nhiều tính năng sẵn có, như quản lý route, cơ sở dữ liệu, xác thực người dùng và bảo mật, giúp tiết kiệm thời gian và công sức cho các nhà phát triển. Thứ hai, Laravel tạo ra mã chất lượng cao và dễ bảo trì. Cấu trúc của nó được thiết kế để đảm bảo tính nhất quán và dễ đọc, điều này giúp các nhà phát triển dễ dàng hiểu, bảo trì và mở rộng ứng dụng trong tương lai. Thứ ba, Laravel tích hợp các tính năng bảo mật mạnh mẽ, như bảo vệ chống lại các cuộc tấn công như SQL injection và cross-site scripting. Điều này rất quan trọng khi xây dựng các ứng dụng web quan trọng, đặc biệt là các website thương mại điện tử hoặc các ứng dụng xử lý dữ liệu nhạy cảm. Cuối cùng, việc sử dụng Laravel có thể tiết kiệm đáng kể thời gian và chi phí so với các framework khác. Nhờ các tính năng sẵn có và cấu trúc rõ ràng, các nhà phát triển có thể tạo ra các ứng dụng phức tạp nhanh hơn, giảm thiểu thời gian phát triển và chi phí tổng thể. Mặc dù WordPress cũng là một lựa chọn phổ biến để thiết kế website, nhưng Laravel và WordPress có những điểm khác biệt đáng kể. Trong khi WordPress thiên về khả năng sử dụng dễ dàng và tích hợp sẵn nhiều tính năng thương mại điện tử, Laravel lại mạnh hơn về thiết kế, tối ưu hóa SEO và tính bảo mật. Khi nào nên sử dụng WordPress và khi nào nên chọn Laravel? Nói chung, WordPress là lựa chọn tuyệt vời cho các website cá nhân, blog hoặc các [website thương mại điện tử](https://terusvn.com/thiet-ke-website-tai-hcm/) quy mô nhỏ đến trung bình. Trong khi đó, Laravel phù hợp hơn cho các ứng dụng web phức tạp, có yêu cầu về tính bảo mật và khả năng tùy biến cao, chẳng hạn như các trang web doanh nghiệp, ứng dụng quản lý nội bộ hoặc các nền tảng thương mại điện tử lớn. Ngoài ra, các nhà phát triển cũng có thể kết hợp sử dụng cả hai, sử dụng WordPress để xây dựng các website hoặc blog, và Laravel để tạo ra các ứng dụng web phức tạp hơn hoặc tích hợp với các hệ thống khác. [Thiết kế website bằng Laravel](https://terusvn.com/thiet-ke-website-tai-hcm/) đem lại nhiều lợi ích như chất lượng mã cao, tính bảo mật mạnh mẽ và khả năng tùy biến lớn. Nó là lựa chọn tuyệt vời cho các doanh nghiệp cần xây dựng các ứng dụng web phức tạp và đáng tin cậy. Khi lựa chọn giữa Laravel và WordPress, các nhà phát triển cần xem xét các yêu cầu cụ thể của dự án và chọn framework phù hợp nhất. Tìm hiểu thêm về [Website Bằng Laravel Là Gì? Lợi Ích Và Vai Trò](https://terusvn.com/thiet-ke-website/thiet-ke-website-bang-laravel/) Digital Marketing: · [Dịch vụ Facebook Ads](https://terusvn.com/digital-marketing/dich-vu-facebook-ads-tai-terus/) · [Dịch vụ Google Ads](https://terusvn.com/digital-marketing/dich-vu-quang-cao-google-tai-terus/) · [Dịch vụ SEO Tổng Thể](https://terusvn.com/seo/dich-vu-seo-tong-the-uy-tin-hieu-qua-tai-terus/) Thiết kế website: · [Dịch vụ Thiết kế website chuẩn Insight](https://terusvn.com/thiet-ke-website/dich-vu-thiet-ke-website-chuan-insight-chuyen-nghiep-uy-tin-tai-terus/) · [Dịch vụ Thiết kế website](https://terusvn.com/thiet-ke-website-tai-hcm/)

terus_technique

Complete metabolic panel test includes

Blood tests play a crucial role in assessing various aspects of our health. Among these tests, the...

https://dev.to/devonj/complete-metabolic-panel-test-includes-207c

Blood tests play a crucial role in assessing various aspects of our health. Among these tests, the Basic Metabolic Panel (BMP) holds significance in providing essential insights into our body’s metabolic functions. Let’s discuss as to what a BMP entails, its components, and why it’s a valuable tool in healthcare. For more info please visit https://mycarelabs.com/testing-solutions/wellness-testing-solutions/basic-metabolic-panel/

devonj

Which CNCF Projects Attract Contributors the Most? Share Your Experience!

Hey Dev Community! I’ve been contributing to open-source projects under the Cloud Native Computing...

https://dev.to/youdontknowwho/which-cncf-projects-attract-contributors-the-most-share-your-experience-311e

opensource, cloud, kubernetes

Hey Dev Community! I’ve been contributing to open-source projects under the Cloud Native Computing Foundation (CNCF), and I’m curious about your experiences. Which CNCF projects have you contributed to, and what drew you to them?

youdontknowwho

Drupal: Rimuovere un plugin fantasma dal database

Fonte:...

https://dev.to/mcale/drupal-rimuovere-un-plugin-fantasma-dal-database-9pj

drupal, php, italian

Fonte: https://drupal.stackexchange.com/questions/315921/removing-phantom-plugin-from-database/320215#320215 Può succedere che quando si disinstalla un modulo la procedura non viene eseguita tutta oppure non è presente nessuna procedura di rimozione, per questo motivo il database rimane "sporco". Normalmente l'errore causato dalla rimozione forzata di un plugin è questo: ```bash [error] Drupal\Component\Plugin\Exception\PluginNotFoundException: The "name-of-plugin" entity type does not exist. in Drupal\Core\Entity\EntityTypeManager->getDefinition() ``` Abilitare la configurazione che mostra tutti i messaggi di errori, può aiutare a capire dove è presente l'errore e dove serve intervenire. L'abilitazione completa dei log la puoi attivare nella pagina qui presente `admin/config/development/logging`. Questa configurazione può aiutarti a capire se il problema sono le configurazioni o il nome del plugin è hardcodato nel tuo codice. Adesso affronteremo come risolvere la problematica se è legata alle configurazioni e per farlo abbiamo due modi possibili: * Esportando tutta la configurazione e reimportandola dopo aver rimosso i richiami al plugin * Agendo direttamente sulle configurazioni presenti in db e rimuovendo il plugin ### Esportando tutta la configurazione e reimportandola Questa soluzione molto probabilmente è tra le più utilizzare se si segue lo standard per la metodologia di rilascio consigliata dalla community di Drupal. Esporta tutta la configurazione attraverso l'interfaccia grafica o con il comando `drush config:export`. Nei file recuperati dall'export effettua una ricerca full-text con il nome di plugin. Rimuovi la sezione di configurazione che sta causando l'errore e importa la configurazione con `drush config:import` ### Agendo direttamente sulle configurazioni presenti in db e rimuovendo il plugin Questa soluzione è utile per chi, come me, non ha la possibilità di esportare tutta la configurazione e reimportarla ma ha bisogno di lavorare "a caldo" sul sito. Per trovare quali configurazioni stanno causando l'errore è possibile eseguire questa query sul db: ```sql SELECT name FROM config WHERE data LIKE "%name-of-plugin%"; ``` La query cerca nella tabella delle configurazioni il plugin incriminato e restituisce i nomi delle configurazioni che richiamano il plugin. Quando si hanno i nomi delle configurazioni si può procedere alla rimozione del plugin. In base al plugin e alla configurazione in errore il metodo di rimozione può leggermente cambiare, adesso prendiamo in considerazione un esempio che può essere un buon punto di partenza anche per altre casistiche. **Es.** Avevo un problema con il plugin `filter_image_lazy_load` a causa di un aggiornamento a Drupal 10 andato male. La query precedente ha restituito queste configurazioni: ``` bash filter.format.basic_html filter.format.full_html filter.format.restricted_html ``` Con il servizio `config.factory` ho caricato le configurazioni e ho verificato dove è presente il problema. Dopo si può procedere alla rimozione del plugin in questo modo: ```php $configName = 'filter.format.basic_html'; $config = \Drupal::service('config.factory')->getEditable($configName); $filters = $config->get('filters'); unset($filters['filter_image_lazy_load']); $config->set('filters', $filters)->save() ``` Puoi fare la stessa identica cosa con `drush config:get filter.format.basic_html` e `drush config:set filter.format.basic_html` oppure in un colpo unico con `drush config:edit filter.format.basic_html` Dopo aver pulito le configurazioni esegui un `drush cache:rebuild` e l'errore dovrebbe essere risolto!

mcale

I AM A STUDENT OF "IT" WHAT SHOULD I DO?

Asalamoalikum and Hello! Introduction I am Abdullah from Pakistan, And i was really wondering what...

https://dev.to/kuroshah/i-am-a-student-of-it-what-should-i-do-3lb1

webdev, beginners, learning, career

Asalamoalikum and Hello! **Introduction** I am Abdullah from Pakistan, And i was really wondering what should i do in my field. I am studying BSIT in a local University currently enrolled in 6th semester with a CGPA of 3.90 out of 4. I have experience in a lot of things and i really need some help to sort my life an Information Security student. First let me introduce my skills so you may know who you are dealing with. **Biggest Flexes** My Biggest Flexes are 2 things, - I am a really fast learner. As far as basics and intermediate levels are concerned i can learn them in 1 to 2 days, Like intermediate working in Kotlin and some minor projects i did them in 2 days. - If i decide to commit my self to a task i will do everything to get it done as soon as possible **My Skills and Experience** - Graphic Designer: I made a lot of things as a graphic designer from Logos to even Professional Poster for Events and Official Advertisements for Universities. It include both Paid and Un-paid work - UI/UX designer: I have also made a number of Web and Application UI and UX designs - Android Developer: I made a lot of Projects and even now am working on some in mostly Java. I can say i am really good at it. (Did alot of paid work in it but not enough) - Web Developer: This is the skill that i am learning right now. - Intermediate skills in C++ and C# - Basics in Game Development. **What i want?** I don't know where i am going and what i need to do in future, My goal for now is to land a Remote job outside my country because truth be told there is not a lot of opportunity in my country. I need a guide from an experienced person who can help me sort my things. I will also be grateful if someone can be my mentor or guider, SO if i need help in their specific field of expertise. Apart from this, Every little help or a advice is appreciated that will lead me to a better and bright future. **Is there anything you would like to suggest?** Will be waiting for your comments!

kuroshah

Mastering CSS Grid Layout: A Comprehensive Guide for Developers

CSS Grid Layout is a powerful tool that allows developers to create complex, responsive web layouts...

https://dev.to/mdhassanpatwary/mastering-css-grid-layout-a-comprehensive-guide-for-developers-4i7f

webdev, css, beginners, programming

CSS Grid Layout is a powerful tool that allows developers to create complex, responsive web layouts with ease. Unlike traditional layout methods such as floats, flexbox, and positioning, CSS Grid offers a two-dimensional system, handling both columns and rows, making it an essential skill for modern web development. ## Understanding the Basics At its core, CSS Grid involves two main elements: the container and the items. The container is the parent element, and the items are its children. By defining the container as a grid, you can then place the items within this grid structure. **html** ``` <div class="container"> <div class="item">Item 1</div> <div class="item">Item 2</div> <div class="item">Item 3</div> </div> ``` **css** ``` .container { display: grid; border: 1px solid #000; } .item { padding: 20px; border: 1px solid #ccc; } ``` ## Defining Columns and Rows The power of CSS Grid comes from its ability to define columns and rows with precision. You can specify the number and size of columns and rows using the `grid-template-columns` and `grid-template-rows` properties. **html** ``` <div class="container"> <div class="item">Item 1</div> <div class="item">Item 2</div> <div class="item">Item 3</div> </div> ``` **css** ``` .container { display: grid; grid-template-columns: 1fr 2fr 1fr; grid-template-rows: auto 100px; gap: 10px; } .item { padding: 20px; border: 1px solid #ccc; } ``` ## Placing Items on the Grid Once you have defined the grid structure, you can place items within it using the `grid-column` and `grid-row` properties. These properties allow you to specify the start and end points of an item within the grid. **html** ``` <div class="container"> <div class="item item1">Item 1</div> <div class="item item2">Item 2</div> <div class="item item3">Item 3</div> </div> ``` **css** ``` .container { display: grid; grid-template-columns: 1fr 1fr 1fr; grid-template-rows: auto 100px; gap: 10px; } .item { padding: 20px; border: 1px solid #ccc; } .item1 { grid-column: 1 / 3; grid-row: 1 / 2; } .item2 { grid-column: 3 / 4; grid-row: 1 / 3; } ``` ## Responsive Design with CSS Grid One of the standout features of CSS Grid is its ability to create responsive layouts. By using fractional units (fr), percentages, and the minmax function, you can design grids that adapt to different screen sizes seamlessly. **html** ``` <div class="container"> <div class="item">Item 1</div> <div class="item">Item 2</div> <div class="item">Item 3</div> <div class="item">Item 4</div> </div> ``` **css** ``` .container { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 10px; } .item { padding: 20px; border: 1px solid #ccc; } ``` ## Advanced Techniques CSS Grid offers several advanced features for creating sophisticated layouts: * Grid Areas: Name specific areas of the grid and place items by referring to these names. **html** ``` <div class="container"> <div class="header">Header</div> <div class="sidebar">Sidebar</div> <div class="content">Content</div> <div class="footer">Footer</div> </div> ``` **css** ``` .container { display: grid; grid-template-areas: "header header" "sidebar content" "footer footer"; gap: 10px; } .header { grid-area: header; padding: 20px; border: 1px solid #ccc; } .sidebar { grid-area: sidebar; padding: 20px; border: 1px solid #ccc; } .content { grid-area: content; padding: 20px; border: 1px solid #ccc; } .footer { grid-area: footer; padding: 20px; border: 1px solid #ccc; } ``` * Implicit Grid: Define how new rows or columns are created when items are placed outside the explicitly defined grid. **html** ``` <div class="container"> <div class="item">Item 1</div> <div class="item">Item 2</div> <div class="item">Item 3</div> </div> ``` **css** ``` .container { display: grid; grid-template-columns: 1fr 1fr; grid-auto-rows: minmax(100px, auto); gap: 10px; } .item { padding: 20px; border: 1px solid #ccc; } ``` * Grid Gaps: Add space between grid items using the `gap` property. **html** ``` <div class="container"> <div class="item">Item 1</div> <div class="item">Item 2</div> <div class="item">Item 3</div> </div> ``` **css** ``` .container { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; } .item { padding: 20px; border: 1px solid #ccc; } ``` ## Browser Support and Tools CSS Grid is well-supported in all modern browsers. Tools like the Firefox Grid Inspector and Chrome DevTools make it easier to visualize and debug grid layouts. ## Conclusion CSS Grid Layout revolutionizes the way we approach web design, offering a flexible and intuitive method for creating complex, responsive layouts. By mastering its basics and exploring its advanced features, developers can significantly enhance their web development skills and deliver more dynamic user experiences.

mdhassanpatwary

Thiết Kế Website In Ấn Tối Ưu Chi Phí

Website in ấn được coi là văn phòng thứ hai của mọi doanh nghiệp trực tuyến. Vì nó cho phép khách...

https://dev.to/terus_technique/thiet-ke-website-in-an-toi-uu-chi-phi-1o7n

website, digitalmarketing, seo, terus

 Website in ấn được coi là văn phòng thứ hai của mọi doanh nghiệp trực tuyến. Vì nó cho phép khách hàng cập nhật các sản phẩm và dịch vụ của công ty. Sử dụng website in ấn của doanh nghiệp sẽ tăng khả năng tiếp cận với nhiều khách hàng hơn. Doanh nghiệp có thể được quảng cáo bất cứ lúc nào. Khách hàng của công ty có thể nhanh chóng tìm đến công ty bằng cách sử dụng website in ấn riêng được thiết kế bởi một công ty thiết kế website chuyên nghiệp. Tìm được những dịch vụ mà công ty cung cấp nhanh hơn, nâng cao thứ hạng của công ty,... Đơn vị in ấn quảng cáo trực tuyến giúp tăng số lượng khách hàng bằng cách giảm cách biệt về địa lý. Doanh nghiệp cung cấp dịch vụ cho khách hàng bất cứ nơi nào họ muốn. Tiện lợi hơn rất nhiều so với trước đây, có thể tương tác và tiếp nhận ý kiến của khách hàng qua website in ấn hiệu quả. Giúp khách hàng tìm kiếm doanh nghiệp nhanh chóng và dễ dàng thay đổi nội dung và dịch vụ của công ty. Các thành phần cần có trong [thiết kế website in ấn chuyên nghiệp, tối ưu](https://terusvn.com/thiet-ke-website-tai-hcm/): Trang chủ: Trình bày đơn giản, khoa học, trang nhã. Màu sắc theo yêu cầu của khách hàng hoặc theo logo của công ty. Header: thông tin về công ty, hotline, tìm kiếm. Thanh menu chính: giới thiệu, dịch vụ, bảng giá, tin tức, dự án, liên hệ… Trang chủ gồm: banner slideshow (thêm xóa sửa không giới hạn). Các dịch dụ chính, tin tức mới nhất. Footer: thông tin về công ty, liên kết mạng xã hội, một số module nổi bật. Giới thiệu: Thông tin giới thiệu như: địa chỉ, thành lập, sứ mệnh, giấy chứng nhận… hình ảnh về công ty. Dịch vụ in ấn: Những dịch vụ liên quan đến in ấn như: in hóa đơn, in bao thư, thiết kế lịch tết… Danh mục dịch vụ gồm nhiều cấp, thêm không giới hạn. Hình ảnh hiển thị đầy đủ, chi tiết dịch vụ gồm hình ảnh, tiêu đề, chi tiết, mô tả ngắn. Các dịch vụ liên quan. Terus cung cấp các mẫu website đa dạng, phù hợp với các ngành nghề đặc biệt là trong lĩnh vực in ấn. Ngoài ra, Terus cũng cung cấp dịch vụ thiết kế website theo yêu cầu riêng của từng khách hàng. Với kinh nghiệm phong phú, đội ngũ chuyên gia và quy trình thiết kế chuyên nghiệp, Terus cam kết mang đến những [giải pháp website chất lượng cao, tối ưu](https://terusvn.com/thiet-ke-website-tai-hcm/) trải nghiệm người dùng và tăng năng suất kinh doanh cho khách hàng. Tìm hiểu thêm về [Thiết Kế Website In Ấn Tối Ưu Chi Phí](https://terusvn.com/thiet-ke-website/terus-thiet-ke-website-in-an/) Các dịch vụ tại Terus: Digital Marketing: · [Dịch vụ Facebook Ads](https://terusvn.com/digital-marketing/dich-vu-facebook-ads-tai-terus/) · [Dịch vụ Google Ads](https://terusvn.com/digital-marketing/dich-vu-quang-cao-google-tai-terus/) · [Dịch vụ SEO Tổng Thể](https://terusvn.com/seo/dich-vu-seo-tong-the-uy-tin-hieu-qua-tai-terus/) Thiết kế website: · [Dịch vụ Thiết kế website chuẩn Insight](https://terusvn.com/thiet-ke-website/dich-vu-thiet-ke-website-chuan-insight-chuyen-nghiep-uy-tin-tai-terus/) · [Dịch vụ Thiết kế website](https://terusvn.com/thiet-ke-website-tai-hcm/)

terus_technique

SQL Oracle

Use of distint Before the 1st column name avoids duplicate data in column can not be used twice on...

https://dev.to/sydney_abuya_87/sql-oracle-169p

**Use of distint** - Before the 1st column name - avoids duplicate data in column - can not be used twice on one table **Use of q and [], ()** - words in side having **Select from dual;** - an unexisting table that can be used **Column aliases** - eg select first_name name; - select first_name as name; - select first_name AS name; **Concatenation using ||** - select first_name || ' ' || last_name as "full name"

sydney_abuya_87

setup ts-reset with next.js (@total-typescript/ts-reset) with 3 simple steps

ts-reset is a free tool that improves TypeScript's default type definitions. It makes them stricter,...

https://your-codes.vercel.app/learn-how-to-setup-ts-reset-with-next-js-total-typescript-ts-reset

typescript, nextjs, tutorial, react

ts-reset is a free tool that improves TypeScript's default type definitions. It makes them stricter, more consistent, and easier to use. By using ts-reset, you can prevent bugs related to type errors and make your code easier to read and maintain. It's similar to how css-reset standardizes styles across different browsers. ts-reset was created by Matt Pocock, who also developed Total TypeScript, a series of workshops designed to help you become highly skilled in TypeScript. If you want to master TypeScript, these workshops are highly recommended!  There are Three simple steps to implement ts-reset in the next.js app directory. ## Step-1: initialize Next.js app ```bash $ pnpm create next-app .../Local/pnpm/store/v3/tmp/dlx-5180 | +1 + .../Local/pnpm/store/v3/tmp/dlx-5180 | Progress: resolved 1, reused 0, downloaded 1, added 1, done √ What is your project named? ... . √ Would you like to use TypeScript? ... No / Yes √ Would you like to use ESLint? ... No / Yes √ Would you like to use Tailwind CSS? ... No / Yes √ Would you like to use `src/` directory? ... No / Yes √ Would you like to use App Router? (recommended) ... No / Yes √ Would you like to customize the default import alias (@/*)? ... No / Yes √ What import alias would you like configured? ... @/* ``` ## Step-2: Add ts-reset package ```bash pnpm add -D @total-typescript/ts-reset ``` ## Step-3: Add `reset.d.ts` create a `reset.d.ts` file in the root of the root of the workspace and then add this single line on it. > This is important to add only this single line in `reset.d.ts` file. ```typescript import "@total-typescript/ts-reset"; ``` And then you are all done. > 🙌 Here's the GitHub repo of with sample [source code 🌟](https://github.com/Your-Ehsan/learn-how-to-setup-ts-reset-with-next-js-total-typescript-ts-reset)

your-ehsan

Buy verified cash app account

Buy verified cash app account Cash app has emerged as a dominant force in the realm of mobile banking...

https://dev.to/mownik_shaha_5505ca2b814e/buy-verified-cash-app-account-293

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mownik_shaha_5505ca2b814e

Best Practices for S3 Security

Bucket Policies: Restrict access using the principle of least privilege. Encryption: Always enable...

https://dev.to/nooruddin-zubair/best-practices-for-s3-security-1jac

- **Bucket Policies:** Restrict access using the principle of least privilege. - **Encryption:** Always enable SSE for data at rest. Use SSE-S3 or SSE-KMS based on your security and compliance requirements. - Access Logging: Enable logging to track access and monitor for unauthorized activities. - Versioning: Enable versioning to protect against accidental deletion or overwrite. - IAM: Use IAM roles and policies to control who can create, modify, or delete S3 resources. - Monitoring: Use Amazon CloudWatch for monitoring S3 access patterns and set up alerts for unusual activities. - Regular Audits: Conduct regular security audits and reviews of your S3 configurations.

nooruddin-zubair

Conventional Commits

Hoje vou falar um pouco sobre a importância dos Conventional Commits (e Gitmojis!) 💻✨ Commits...

https://dev.to/ericarodrigs/conventional-commits-5c1o

conventionalcommits, gitmojis, programming, softwaredevelopment

# Hoje vou falar um pouco sobre a importância dos *Conventional Commits* (e *Gitmojis*!) 💻✨ Commits padronizados são essenciais para manter a qualidade e a organização do código-fonte de um projeto. A comunidade em geral recomenda seguir padrões como os *Conventional Commits*, que especificam um formato claro para as mensagens de commit, como "tipo(scope): mensagem", onde o tipo indica o propósito do commit (ex: feat para novas funcionalidades, fix para correções de bugs) e o escopo opcional descreve a parte do código alterada. É crucial que as mensagens sejam sucintas e claras, destacando de forma resumida o que foi feito em cada commit. Isso não só melhora a compreensão do histórico do projeto, mas também facilita a colaboração entre os membros da equipe, por exemplo tornando mais fluido o processo de code review. Usar *Conventional Commits* ajuda a padronizar as mensagens de commit, facilitando a compreensão do histórico do projeto e automatizando tarefas como geração de changelogs. Se você ainda não conhece, recomendo dar uma olhada neste guia essencial: [Conventional Commits Guide](https://www.conventionalcommits.org/en/v1.0.0/). Além disso, também costumo usar *Gitmojis* no início dos commits. Acho que traz uma dose extra de clareza e diversão ao nosso trabalho diário. 🎉 Para quem não sabe, os Gitmojis são emojis usados para descrever o propósito de um commit de forma visual, como uma pequena ilustração do que foi feito. Vou deixar um [link](https://gitmoji.dev/) da página que uso como referência🌟 ✨ Dica de ouro: para facilitar ainda mais o uso de *Conventional Commits*, eu utilizo uma extensão no VSCode chamada *Conventional Commits*. Ela simplifica o processo e ajuda a manter a consistência nas mensagens de commit. Com certeza existe uma extensão parecida se você usa outra IDE para codar. Vamos juntos melhorar nossos fluxos de trabalho e comunicação no desenvolvimento de software! 💪🌐

ericarodrigs

Venturing into the New Age of Digital Interaction

In today's digital era, where technology is a pivotal aspect of daily life, the integration of social...

https://dev.to/rapidinnovation/venturing-into-the-new-age-of-digital-interaction-5bkb

In today's digital era, where technology is a pivotal aspect of daily life, the integration of social media with advanced technologies like pose estimation is heralding a significant evolution in the way we interact digitally. Picture a scenario where navigating through your social media feed is no longer a static, one-dimensional experience but a dynamic, multi-faceted journey. Filters and digital effects transcend their traditional roles, becoming interactive entities that respond to your movements with real-time feedback and adaptation. This revolutionary concept, which once belonged to the realms of science fiction, is rapidly materializing into our reality, reshaping our digital interactions at a fundamental level. ## The Magic of Pose Estimation in Social Media Filters Imagine a scenario where you are accompanied by a digital entity, akin to a sensitive and responsive artist, capable of understanding and mirroring your every move with remarkable precision. 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This level of interactivity signifies a groundbreaking shift in digital interaction. It's a step towards dismantling the long-standing barriers between the virtual and the real, providing users with an enhanced, more realistic online experience. ## A New Frontier for Marketers and Brands: Embracing Interactive Technology Pose estimation technology opens a new chapter for marketers and brands, presenting a treasure trove of untapped potential. It's not just a tool; it's a gateway to innovative marketing strategies that transcend traditional visual appeal, inviting users into deeply interactive and engaging experiences. This technology empowers brands to craft campaigns that are not just seen but felt and experienced, creating immersive environments that resonate on a personal level with users. It's about building campaigns that are dynamic and adaptive, responding to user movements and actions, thereby fostering memorable interactions. ## Transforming Online Shopping with Enhanced Virtual Try-Ons Pose estimation technology is poised to revolutionize the realm of online shopping. This innovation takes virtual try-ons to a new level of realism and precision, allowing consumers to see how products would look and move with them in real-time. It's not just about trying on a piece of clothing or accessory; it's about experiencing how it fits, moves, and feels virtually. This level of interaction is expected to dramatically boost consumer confidence in online shopping, leading to more informed purchasing decisions. The implications for customer satisfaction are immense, as this technology bridges the gap between the convenience of online shopping and the assurance of trying things in-store. ## Conclusion: The Dawn of an Interactive and Exciting Digital Future The integration of social media, marketing, and pose estimation technology is ushering in a digital renaissance. This convergence marks the beginning of a future where digital experiences are not just passively observed but actively felt and engaged with. It heralds an era of immersive, personalized digital connections, breaking through the limitations of traditional screen-based interactions. As we stand at the threshold of this groundbreaking era, the horizon of creativity and innovation extends infinitely before us. The potential of this new digital landscape is only limited by the extent of our imagination. Are you ready to be a part of this exhilarating odyssey into the future of digital engagement? 📣📣Drive innovation with intelligent AI and secure blockchain technology! Check out how we can help your business grow! [Blockchain App Development](https://www.rapidinnovation.io/service- development/blockchain-app-development-company-in-usa) [Blockchain App Development](https://www.rapidinnovation.io/service- development/blockchain-app-development-company-in-usa) [AI Software Development](https://www.rapidinnovation.io/ai-software- development-company-in-usa) [AI Software Development](https://www.rapidinnovation.io/ai-software- development-company-in-usa) ## URLs * <https://www.rapidinnovation.io/post/social-media-filters-marketing-with-advanced-pose-estimation-techniques> ## Hashtags #DigitalInteraction #PoseEstimation #InteractiveTechnology #VirtualTryOns #FutureOfMarketing

rapidinnovation

MapReduce Vs Tez

Apache Hadoop uses MapReduce as it's programming model for distributed processing of Big Data, but...

https://dev.to/shvshydv/mapreduce-vs-tez-171g

hadoop, dataengineering, database, datascience

Apache Hadoop uses MapReduce as it's programming model for distributed processing of Big Data, but instead of writing multiple MapReduce jobs, we can also utilize the power of Hive or Pig. **Hive:** Hive gives an SQL-like interface to query data stored in various databases and file systems that integrate with Hadoop. **Pig:** Pig is a high-level platform for creating programs that run on Apache Hadoop. It provides an SQL-like scripting language. Both Hive queries and Pig scripts are compiled to MapReduce programs in the background, and then jobs are executed in parallel across the Hadoop cluster. But instead of MapReduce both Hive and Pig can use **Tez**. ---  --- ## Apache Tez Apache Tez is a framework that creates a complex **Directed Acyclic Graph (DAG)** of tasks for processing data. It uses DAG to analyze all the relationship between the different steps and figures out the most optimal path to get the result. Therefore, Tez is much **faster as compared to MapReduce**. This technique is also used in Apache Spark for large-scale data processing. ## MapReduce Vs Tez MapReduce access the disk/HDFS multiple times during it's data-flow i.e Mapper -> Shuffle & Sort -> Reducer. It will write & read data/modified data during each of these steps, resulting in **5-6 disk access** for a single MapReduce job. On the other hand Tez gets the data from the disk, performs all the steps, stores the **intermediate results in the memory**, performs **vectorization**(processes batch of rows instead of one row at a time) and produces the output. While MapReduce makes multiple reads/writes to HDFS, Tez avoids unneeded access to HDFS. 

shvshydv

Thiết Kế Website Nhà Hàng Tiệc Cưới Đẹp Mắt, Thu Hút

Với website nhà hàng tiệc cưới, thể hiện phong cách chuyên nghiệp của một nhà hàng tiệc cưới. Mọi cá...

https://dev.to/terus_technique/thiet-ke-website-nha-hang-tiec-cuoi-dep-mat-thu-hut-2iej

website, digitalmarketing, seo, terus

 Với website nhà hàng tiệc cưới, thể hiện phong cách chuyên nghiệp của một nhà hàng tiệc cưới. Mọi cá nhân và công ty cung cấp các loại dịch vụ đều làm quảng cáo, từ thực tế cho đến tiếp thị truyền thông. Mỗi kênh thông tin đều truyền đạt thương hiệu của họ. Ngoài ra, nó còn giúp cho khách hàng dễ dàng tìm hiểu về nhà hàng tiệc cưới. Thông qua hình ảnh và bài viết trên trang website nhà hàng tiệc cưới, khách hàng có thể tham khảo về nhà hàng, phong cách và quy mô dễ dàng. Họ dễ dàng quyết định liệu họ có muốn tổ chức tiệc cưới tại nhà hàng hay không nhờ những hình ảnh và bài viết đó. Các yếu tố cần có trong [thiết kế website nhà hàng tiệc cưới chuyên nghiệp, thu hút](https://terusvn.com/thiet-ke-website-tai-hcm/): Chuẩn SEO, responsive design: Hiện tại, tất cả các trang website nhà hàng tiệc cưới đều tương thích với điện thoại di động. Thiết kế web đạt chuẩn UX/UI rất quan trọng để cải thiện trải nghiệm người dùng, đảm bảo giao diện chuẩn và lướt web mượt mà trên điện thoại. Những website nhà hàng tiệc cưới như vậy cũng đáp ứng các yêu cầu cao hơn. Đẩy nhanh thứ hạng trên trình duyệt tìm kiếm của Google sẽ dễ dàng. Để tăng số lượng người truy cập vào trang web của bạn, hãy đặt tiêu chí này lên hàng đầu. Tích hợp tính năng Google Map: Một số khách hàng sẽ truy cập website của bạn để đọc thông tin và sau đó đến tận nơi để xem xét và trải nghiệm. Họ sẽ làm điều này bằng cách sử dụng Google Map. Hoặc khách tham dự tiệc cưới của họ cũng truy cập nhà hàng của bạn trực tuyến. Giao diện: Trang web phải có một thiết kế thẩm mỹ và có một cấu trúc dễ sử dụng để phù hợp với tất cả mọi người, nhằm mang lại trải nghiệm tốt và khả năng tương tác của người dùng. Thông tin chi tiết: cung cấp rõ các thông tin liên quan đến tiệc cưới. Tối ưu thời gian tải trang: Đảm bảo thời gian nhanh chóng, tránh để cho khách hàng đợi quá lâu họ sẽ nhanh chán nản và bỏ lỡ trang web của bạn. Liên lạc và tương tác: Tích hợp các tính năng trò chuyện trực tuyến hoặc các công cụ tương tự để tạo ra một trải nghiệm tương tác và giúp người dùng cảm thấy được đáp ứng và quan tâm đến nhu cầu của họ. Terus - đơn vị cung cấp [dịch vụ website nhà hàng tiệc cưới với thiết kế chuyên nghiệp, hiện đại và tối ưu SEO](https://terusvn.com/thiet-ke-website-tai-hcm/). Với kinh nghiệm và năng lực chuyên môn vững chắc, Terus cam kết mang đến những giải pháp website chất lượng cao, giúp doanh nghiệp kinh doanh nhà hàng tiệc cưới nâng cao hiệu quả hoạt động, tăng trưởng kinh doanh và khẳng định vị thế trên thị trường. Tìm hiểu thêm về [Thiết Kế Website Nhà Hàng Tiệc Cưới Đẹp Mắt, Thu Hút](https://terusvn.com/thiet-ke-website/thiet-ke-website-nha-hang-tiec-cuoi/) Các dịch vụ tại Terus: Digital Marketing: · [Dịch vụ Facebook Ads](https://terusvn.com/digital-marketing/dich-vu-facebook-ads-tai-terus/) · [Dịch vụ Google Ads](https://terusvn.com/digital-marketing/dich-vu-quang-cao-google-tai-terus/) · [Dịch vụ SEO Tổng Thể](https://terusvn.com/seo/dich-vu-seo-tong-the-uy-tin-hieu-qua-tai-terus/) Thiết kế website: · [Dịch vụ Thiết kế website chuẩn Insight](https://terusvn.com/thiet-ke-website/dich-vu-thiet-ke-website-chuan-insight-chuyen-nghiep-uy-tin-tai-terus/) · [Dịch vụ Thiết kế website](https://terusvn.com/thiet-ke-website-tai-hcm/)

terus_technique

Thiết Kế Website Trang Trại Uy Tín, Chất Lượng Cao

Trong thời kỳ công nghiệp hóa, mọi hoạt động sản xuất đều được tăng cường và công nghệ và máy móc...

https://dev.to/terus_technique/thiet-ke-website-trang-trai-uy-tin-chat-luong-cao-l88

website, digitalmarketing, seo, terus

 Trong thời kỳ công nghiệp hóa, mọi hoạt động sản xuất đều được tăng cường và công nghệ và máy móc hiện đại đều được cải tiến và nâng cấp. Và tất nhiên, ngày càng có nhiều trang trại có quy mô lớn hơn. Mặc dù mô hình sản xuất trang trại mang lại hiệu quả kinh tế cao, nhưng câu hỏi về đầu ra luôn là một bài toán khó có thể ổn định. Những người chủ trang trại có thể suy nghĩ về sản xuất và xây dựng kinh tế, nhưng họ vẫn chưa biết làm thế nào để quảng bá thương hiệu trang trại của họ một cách hiệu quả. Thiết kế website trang trại là một phương pháp để xây dựng uy tín, thương hiệu hiệu quả. Các thành phần cần có trong một [website trang trại chuyên nghiệp, uy tín](https://terusvn.com/thiet-ke-website-tai-hcm/): Trang chủ: Là thành phần quan trọng nhất của bất kỳ trang web nào, vì vậy nó phải được hoàn thành một cách chi tiết và tốt nhất có thể. Đây sẽ là nơi cung cấp thông tin cơ bản như slogan, logo, menu, sản phẩm, khách hàng, đối tác và định hướng phát triển. Nội dung đầy đủ, thiết kế hài hòa, phù hợp với mô hình trang trại và loại sản phẩm. Giới thiệu: Phần giới thiệu cần được thiết kế đầy đủ để đảm bảo mỗi trang trại có thể dễ dàng giới thiệu những thông tin chi tiết, cụ thể về trang trại và cánh đồng sản phẩm của mình. Các thông tin về số năm hoạt động, năng lực, hệ thống dịch vụ cung cấp, định hướng phát triển,… và các thông tin khác phải được cung cấp chi tiết và cụ thể. Nhờ đó, khách hàng sẽ phần nào đánh giá được độ uy tín, tính chuyên nghiệp của trang trại. Sản phẩm: Danh mục sản phẩm riêng, bộ lọc và thông tin chi tiết sản phẩm. Khách hàng mới dễ dàng lựa chọn sản phẩm phù hợp vì kết quả tìm kiếm mới cụ thể. Dịch vụ: Các dịch vụ được cung cấp bởi trang trại sẽ được giới thiệu trong mục này. Bao gồm danh mục các bài viết liên quan đến các dịch vụ cũng như chi tiết về giá cả, hình ảnh thực tế, mô tả và chi tiết của từng dịch vụ. Hệ thống phân phối: Đây là một tính năng rất quan trọng mà bất kỳ trang trại nào cũng phải có. Liệt kê đầy đủ danh sách các đại lý và hệ thống phân phối phải được hiển thị theo địa điểm. Điều này giúp khách hàng tìm kiếm bạn dễ dàng hơn và mua hàng tại các đại lý của bạn. Tin tức: Với chức năng này, mọi tin tức liên quan đến trang trại hoặc hoạt động của trang trại phải được công khai. Thông tin sản phẩm, hướng dẫn và tin tức trang trại. Tất cả những thông tin này phải được xây dựng bằng các bài viết chi tiết, cụ thể và rõ ràng để khách hàng có thể dễ dàng đọc. Tuyển dụng: Tin tuyển dụng nhân viên hiển thị trên website trang trại. Tất cả các thông tin liên quan đến việc tuyển dụng nên được cung cấp một cách chi tiết và rõ ràng, và các ứng tuyển nên được gửi trực tiếp hoặc được gửi qua internet. Liên hệ: Tại mục này trên website trang trại, mọi thông tin liên quan từ địa chỉ trụ sở trang trại, hotline, email,… và một số phương thức liên hệ khác cần được cung cấp cụ thể. Với [dịch vụ thiết kế website trang trại chuyên nghiệp theo yêu cầu](https://terusvn.com/thiet-ke-website-tai-hcm/), chúng tôi sẽ giúp thực hiện hóa ý tưởng và mong muốn của bạn một cách tốt nhất. Nếu bạn chưa có được cho mình một ý tưởng hoàn chỉnh hoàn toàn có thể tìm xem qua các mẫu của chúng tôi từ đó kết hợp ra website ưng ý nhất của bạn. Terus đem tới dịch vụ thiết kế website trang trại chuyên nghiệp theo yêu cầu hoàn toàn khác biệt cho khách hàng. Với lượng website mẫu không lổ hơn 3000 mẫu và được cập nhật mới nhất. Terus tự tin sẽ làm bạn ấn tượng với dịch vụ chúng tôi cung cấp. Liên hệ với Terus ngay hôm nay. Tìm hiểu thêm về [Thiết Kế Website Trang Trại Uy Tín, Chất Lượng Cao](https://terusvn.com/thiet-ke-website/terus-thiet-ke-website-trang-trai/) Các dịch vụ tại Terus: Digital Marketing: · [Dịch vụ Facebook Ads](https://terusvn.com/digital-marketing/dich-vu-facebook-ads-tai-terus/) · [Dịch vụ Google Ads](https://terusvn.com/digital-marketing/dich-vu-quang-cao-google-tai-terus/) · [Dịch vụ SEO Tổng Thể](https://terusvn.com/seo/dich-vu-seo-tong-the-uy-tin-hieu-qua-tai-terus/) Thiết kế website: · [Dịch vụ Thiết kế website chuẩn Insight](https://terusvn.com/thiet-ke-website/dich-vu-thiet-ke-website-chuan-insight-chuyen-nghiep-uy-tin-tai-terus/) · [Dịch vụ Thiết kế website](https://terusvn.com/thiet-ke-website-tai-hcm/)

terus_technique

dotnet beginner guidelines

1/ Object-Oriented Programming (OOP) is an essential paradigm for every programmer. It empowers...

https://dev.to/imakash/dotnet-beginner-guidelines-40e9

dotnetcore, dotnet, dotnetframework, csharp

1/ Object-Oriented Programming (OOP) is an essential paradigm for every programmer. It empowers developers with a powerful set of tools and concepts to design and build software systems efficiently. Without OOP, it's like being a soldier without a gun - missing out on a fundamental approach that enhances code organization, reusability, and maintainability. - https://www.c-sharpcorner.com/UploadFile/84c85b/object-oriented-programming-using-C-Sharp-net/ - https://www.youtube.com/watch?v=7eA70JjiZ9c - https://www.youtube.com/watch?v=TS4GwQkjWPU 2/ Structure with C# (Need a basic understanding of data structure) - https://learn.microsoft.com/en-us/dotnet/standard/collections/ - https://dev.to/adavidoaiei/fundamental-data-structures-and-algorithms-in-c-4ocf 3/ Algorithms with C# (Need basic understanding) - https://www.w3resource.com/csharp-exercises/basic-algo/index.php 4/ C# Basic topics (for more understanding please google it.) - https://www.w3schools.com/cs/index.php - https://www.guru99.com/c-sharp-tutorial.html - https://www.tutorialspoint.com/Asynchronous-programming-in-Chash-using-Async-and-Await-keyword - https://www.youtube.com/watch?v=gfkTfcpWqAY&t=10s&ab_channel=ProgrammingwithMosh 5/ C# Basic to advance topics (not necessary as a beginner if you know this thing that’s a plus) - https://www.tutorialspoint.com/csharp/csharp_tutorial.pdf - https://www.youtube.com/watch?v=jcn5uCZAk2w&list=PLLWMQd6PeGY12yNE714jffLFnMVZCwvvZ 6/ C# in Details (if you want to know more about C# then google it because it's free.) - https://www.youtube.com/playlist?list=PLUOequmGnXxPjam--7GAls6Tb1fSmL9mL 7/ Basic SQL Query (SQL (Structured Query Language) plays a crucial role when working with C# and databases. - https://www.sqlservertutorial.net/sql-server-basics/ - https://www.guru99.com/ms-sql-server-tutorial.html - https://www.youtube.com/watch?v=h0nxCDiD-zg&t=1377s&ab_channel=KevinStratvert _**You can practice SQL problems in HackerRank - https://www.hackerrank.com/domains/sql**_ 8/ MVC framework with C# - https://www.youtube.com/watch?v=E7Voso411Vs&ab_channel=ProgrammingwithMosh - https://www.guru99.com/mvc-tutorial.html 9/ LINQ (Language-Integrated Query) This is also a must-know topic for those who want to work with dotnet. - https://www.tutorialsteacher.com/linq - https://www.youtube.com/playlist?list=PL6n9fhu94yhWi8K02Eqxp3Xyh_OmQ0Rp6 **You can find some awesome projects to understand more about MVC with C#** https://github.com/SR-Akash/TMS-Transport-Management-System https://github.com/SR-Akash/Coaching_Management https://github.com/SR-Akash/School-Account-Management 10/ Understanding Rest API - Understanding REST API is crucial for developing web applications using ASP.NET Core. REST is an architectural style that defines a set of principles and constraints for building scalable, reliable, and loosely coupled web services. - https://www.youtube.com/watch?v=6pn70EsvoWk&list=PLz2xCPyrlKZYNqJW1-_zp83fJq-G991cO - https://www.youtube.com/playlist?list=PLUOequmGnXxOgmSDWU7Tl6iQTsOtyjtwU _বেশ কয়েক বছর সফটওয়্যার ইন্ডাস্ট্রিতে কাজ করার ফলে আমাকে অনেকেই বিভিন্ন সময় প্রশ্ন করে থাকেন যে একজন ফ্রেশ গ্রাজুয়েট বা একজন ১১/১২ সেমিস্টারের স্টুডেন্ট হিসাবে কিভাবে সফটওয়্যার কোম্পানিতে ইন্ট্রানশীপ পেতে পারেন। আমি যেহেতু Backend এ dotnet নিয়ে কাজ করি সুতরাং আমার এক্সপেরিয়েন্স থেকে বিগিনারদের জন্য dotnet এর উপর একটা গাইডলাইন শেয়ার করার চেষ্টা করলাম। এইখানে সেই সব টপিকগুলো দেওয়া আছে যে গুলো একজন ইন্ট্রান এর থেকে একটা সফটওয়্যার কোম্পানি এক্সপেক্ট করে.. Note: কোম্পানি টু কোম্পানি ভ্যারি করতে পারে. _

imakash

bartowski/Hathor_Respawn-L3-8B-v0.8-GGUF-torrent

https://aitorrent.zerroug.de/bartowski-hathor_respawn-l3-8b-v0-8-gguf-torrent/

https://dev.to/octobreak/bartowskihathorrespawn-l3-8b-v08-gguf-torrent-5e47

ai, machinelearning, beginners

https://aitorrent.zerroug.de/bartowski-hathor_respawn-l3-8b-v0-8-gguf-torrent/

octobreak

Speculation Rules API: Selectores y carga dinámica

En un post anterior escribí un poco sobre Speculation Rules API y como podíamos usarla para hacer un...

https://dev.to/dezkareid/speculation-rules-api-selectores-y-carga-dinamica-4il8

webdev, javascript, webperf

En un [post anterior](https://dev.to/dezkareid/instant-navigation-con-speculation-rules-api-1dnc) escribí un poco sobre [Speculation Rules API](https://developer.mozilla.org/en-US/docs/Web/API/Speculation_Rules_API) y como podíamos usarla para hacer un prerender de páginas para dar una sensación de navegación instantanea a los usuarios. En este post vamos a hablar sobre como cargar dinámicamente un script con nuestras Speculation Rules y como usar selectores para seleccionar las páginas a las que queremos hacer prerender. Para ello planteemos el siguiente escenario. > Basados en la analítica de nuestro sitio web, determinamos que los usuarios tipo A, en un 80% de los casos hacen click en el link 1 y los usuarios tipo B, en un 89% de los casos hacen click en link 2. Al analizar este caso vemos que tenemos un caso concreto donde podemos hacer prerender. Recuerden, el prerender es útil pero también es peligroso ya que al final quieras o no estas consumiento recursos. Bueno para este caso necesitamos * Nuestra web (página principal, pagina a la que apunte el link 1 y link 2 respectivamente) * Un script para cargar nuestras reglas de manera dinámica ## Nuestra web Primero nuestra web, algo simple para evitar mas carga cognitiva de la necesaria Pagina principal ```html <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8" /> <meta name="viewport" content="width=device-width, initial-scale=1.0" /> <title>Main page</title> </head> <body> <h1>Main page</h1> <a href="/link1.html" class="link1">Link 1</a> <br /> <a href="/link2.html" class="link2">Link 2</a> <script async defer type="application/javascript"> /* Todo nuestro código irá aquí */ </script> </body> </html> ``` Pagina link 1 ```html <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8" /> <meta name="viewport" content="width=device-width, initial-scale=1.0" /> <title>Link 1</title> </head> <body> <h1>Link 1</h1> <a href="/">Back to main page</a> </body> </html> ``` Página link 2 ```html <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8" /> <meta name="viewport" content="width=device-width, initial-scale=1.0" /> <title>Link 2</title> </head> <body> <h1>Link 2</h1> <a href="/">Back to main page</a> </body> </html> ``` ## Script Nuestro script tendrá 2 partes primero una función que creará nuestro speculation rules object, este recibirá al usuario para decidir el contenido de la regla y la segunda parte es la que carga el script ```javascript function createSpeculationRulesObject(user) { const mapHrefByType = { A: '/link1.html', B: '/link2.html', }; return { prerender: [ { where: { href_matches: mapHrefByType[user.type], }, }, ], }; } function injectSpeculationRules(speculationRulesObject) { const scriptType = 'speculationrules'; if (HTMLScriptElement.supports && HTMLScriptElement.supports(scriptType)) { const specScript = document.createElement('script'); specScript.type = scriptType; specScript.textContent = JSON.stringify(speculationRulesObject); document.body.append(specScript); } } const user = { type: 'A', }; const speculationRulesObject = createSpeculationRulesObject(user); injectSpeculationRules(speculationRulesObject); ``` Vamos analizar directamente el speculation rules object ```javascript { prerender: [ { where: { href_matches: mapHrefByType[user.type], }, }, ], }; ``` En ejemplos anteriores usabamos una lista de urls usando la propiedad `urls: ["link1", "link2", "etc"]`([doc](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/script/type/speculationrules#urls)). En este ejemplo podríamos agregar a la lista la página sin ningún problema. Pero queremos usar la propiedad `where`([doc](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/script/type/speculationrules#where)) ya que es más flexible, en este momento usamos la propiedad `href_matches`([doc](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/script/type/speculationrules#href_matches)) con la cual se hace el prerender de los elementos que apunten a las urls que hagan match pero también podríamos usar la propiedad `selector_matches`([doc](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/script/type/speculationrules#selector_matches)). Si ejecutas el ejemplo con un servidor y abres tus devtools en Application veras lo siguiente:  ¿Qué es lo que pasó? Antes de explicar lo que pasó haz lo siguiente, con las devtools abiertas en Speculative loads, ve al enlace link1 y haz un click largo, veras lo siguiente  Ahora si se viene lo chido, el speculation rules object hay una propiedad llamada `eagerness` ([info aquí](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/script/type/speculationrules#eagerness)). Esta indica cuando debe hacerse el prerender y toma un valor por default dependiendo de que propiedades declare el objeto. Cuando el objeto define la propiedad `urls` el valor por defecto de eagerness será "https://developer.mozilla.org/en-US/docs/Web/HTML/Element/script/type/speculationrules#immediate", lo que quiere decir que el prerender se hará lo más rápido posible. Cuando el objeto define la propiedad `where` el valor por defecto de eagerness será "[conservative](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/script/type/speculationrules#conservative)", lo que quiere decir que el prerender se hará hasta que ocurra un evento como un click sobre el link. > El objeto speculation rule no puede tener la propiedad `urls` y `where` a la vez Para este ejemplo queremos que cargue inmediatamente así que definamos eagerness con el valor immediate y cambiemos el usuario que le pasamos con type B (solo para variar). Nota, esta API es muy sensible a typos, así que si te equivocas al definir alguna propiedad dejará de funcionar. ```javascript function createSpeculationRulesObject(user) { const mapHrefByType = { A: '/link1.html', B: '/link2.html', }; return { prerender: [ { where: { href_matches: mapHrefByType[user.type], }, eagerness: 'immediate', }, ], }; } ``` Ahora si recargas la página veras como el prerender se realiza sin necesidad de una interacción.  Para finalizar, vamos a cambiar un poco el script y en lugar de usar urls usaremos selectores. ```javascript function createSpeculationRulesObject(user) { const mapSelectorsByType = { A: '.link1', B: '.link2', }; return { prerender: [ { where: { selector_matches: mapSelectorsByType[user.type], }, eagerness: 'immediate', }, ], }; } ```  Tenemos exactamente el mismo resultado. Como dato extra, si al momento de agregar la regla no hay algún elemento que haga match, no hay ningún problema, en cuanto exista el prerender se ejecutará. ## Conclusiones Puedes usar Speculation Rules API para hacer prerender dinámico basada en la data de tu aplicación. En este caso usamos "immediate" pero en casos de la vida real podemos tomar en cuenta mas factores para hacer la inyección de reglas o incluso usar un eagerness con el valor `moderate` ([doc](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/script/type/speculationrules#moderate)) que inicia el render cuando el elemento esta en el viewport y se hace un hover. Si bien podemos cargar una páginas más rápido también hay que ser cuidadosos con el consumo de recursos

dezkareid

How to Install Coolify with Docker Fix on Ubuntu 24.04

How to Install Coolify with Docker Fix on Ubuntu 24.04 Coolify is a powerful tool for...

https://dev.to/sh20raj/how-to-install-coolify-with-docker-fix-on-ubuntu-2404-4ed4

docker, coolify, ubuntu, digitalocean

## How to Install Coolify with Docker Fix on Ubuntu 24.04 Coolify is a powerful tool for managing applications using Docker containers. Here’s how to install Coolify and resolve Docker daemon connectivity issues on Ubuntu 24.04. ### Prerequisites - Ubuntu 24.04 LTS installed with root access or sudo privileges. - Internet connectivity to download packages. ### Step 1: Install Coolify 1. **Download and Run Installer Script:** Open a terminal and execute the following command to download and run the Coolify installer script: ```bash curl -fsSL https://cdn.coollabs.io/coolify/install.sh | bash ``` This script will handle the installation of Coolify and its dependencies. ### Step 2: Fix Docker Connectivity Issue If you encounter the error "Cannot connect to the Docker daemon at unix:///var/run/docker.sock", follow these steps to resolve it: 1. **Check Docker Daemon Status:** Verify if Docker is running by executing: ```bash sudo systemctl status docker ``` If Docker is not active, start it with: ```bash sudo systemctl start docker ``` 2. **Enable Docker Service:** Ensure Docker starts automatically on boot: ```bash sudo systemctl enable docker ``` 3. **Verify Docker Installation:** Confirm Docker is installed and accessible: ```bash docker --version ``` 4. **Add User to Docker Group (Optional):** If needed, add your user to the `docker` group to run Docker commands without sudo: ```bash sudo usermod -aG docker $USER ``` Log out and log back in for group changes to take effect. 5. **Restart Docker Service:** Restart Docker to apply any changes made: ```bash sudo systemctl restart docker ``` ### Step 3: Verify Coolify Installation Once Docker connectivity is fixed, verify Coolify installation by accessing its command-line interface or web interface as per the installation instructions. ### Conclusion By following these steps, you can install Coolify and resolve Docker daemon connectivity issues on Ubuntu 24.04. This setup allows you to efficiently manage applications using Docker containers through the Coolify platform.

sh20raj

Buy verified BYBIT account

Buy verified BYBIT account In the evolving landscape of cryptocurrency trading, the role of a...

https://dev.to/mownik_shaha_5505ca2b814e/buy-verified-bybit-account-33gf

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mownik_shaha_5505ca2b814e

Authentication and Authorization in Node.js

The authentication process confirms a user's identity using credentials by validating who they claim...

https://dev.to/akankshaagrawal13/authentication-and-authorization-in-nodejs-3oe1

**The authentication process** confirms a user's identity using credentials by validating who they claim to be. Authentication assures an application's security by guaranteeing that only those with valid credentials can access the system. Authentication is the responsibility of an application's backend. Three popular authentication methods in Node.js include: 1. Session-based 2. Token-based 3. Passwordless Let's explain a little bit about each of these methods and compare them. **Session-based** Session-based authentication is the oldest form of authentication technology. Typically, the flow of a session is as follows: 1. The user uses their credentials to log in. 2. The login credentials are verified against the credentials in a database. The database is responsible for storing which resources can be accessed based on the session ID. 3. The server creates a session with a session ID that is a unique encrypted string. The session ID is stored in the database. 4. The session ID is also stored in the browser as a cookie. 5. When the user logs out or a specified amount of time has passed, the session ID is destroyed on both the browser and the database. **Token-based** Token-based security entails two parts: authentication and authorization. Authentication is the process of providing credentials and obtaining a token that proves the user's credentials. Authorization refers to the process of using that token so the resource server knows which resources the user should have access to. Token-based Authentication Token-based authentication uses access tokens to validate users. An access token is a small piece of code that contains information about the user, their permissions, groups, and expirations that get passed from a server to the client. An ID token is an artifact that proves that the user has been authenticated. The **token** contains **three parts, the header, the payload, and the signature.** The header contains information about the type of token and the algorithm used to create it. The payload contains user attributes, called claims, such as permissions, groups, and expirations. The signature verifies the token's integrity, meaning that the token hasn’t changed during transit. A JSON web token, pronounced "jot" but spelled JWT, is an internet standard for creating encrypted payload data in JSON format. A user's browser makes a call to an authentication server and gets access to a web application. The authentication server then passes back an ID token which is stored by the client as an encrypted cookie. The ID token is then passed to the app on the web server as proof that the user has been authenticated. **Token-based Authorization** This flowchart shows the workflow of a token through the authorization process. The authorization process gets executed when the web application wants to access a resource, for example, an API that is protected from unauthorized access. The user authenticates against the Authorization server. The Authorization server creates an access token (note that the ID token and access token are two separate objects) and sends the access token back to the client, where the access token is stored. Then when the user makes requests or resources, the token is passed to the resource, also called an API server. The token gets passed with every HTTP request. The token contains embedded information about the user's permissions without the need to access those permissions from the authorization server. Even if the token is stolen, the hacker doesn't have access to the user's credentials because the token is encrypted. **Passwordless** With passwordless authentication, the user does not need login credentials, but rather, they gain access to the system by demonstrating they possess a factor that proves their identity. Common factors include biometrics such as a fingerprint, a "magic link" sent to their email address, or a one-time passcode sent to a mobile device. Password recovery systems now commonly use passwordless authentication. Passwordless authentication is achieved using Public Key and Private Key Encryption. In this method, when a user registers for the app, the user's device generates a private key/public key pair that utilizes a factor that proves their identity, as noted above. The public key is used to encrypt messages, and the private key is used to decrypt them. The private key is stored on the user's device, and the public key is stored with the application and registered with a registration service. Anyone may access the public key, but the private key is only known to the client. When the user signs into the application, the application generates a login challenge, such as requesting biometrics, sending a "magic link", or sending a special code via SMS, encrypting it with the public key. The private key allows the message to be decrypted. The app then verifies the sign-in challenge and accepts the response to authorize the user. In this reading, you learned that: **Authentication is the process of confirming a user's identity using credentials by validating who they claim to be. Session-based authentication uses credentials to create a session ID stored in a database and the client's browser. When the user logs out, the session ID is destroyed.** **Token-based authentication uses access tokens, often JWTs, that get passed between server and client with the data that is passed between the two.** **Passwordless authentication uses public/private key pairs to encrypt and decrypt data passed between client and server without the need for a password.**

akankshaagrawal13

MongoDB optimization: Fundamentals of MongoDB (part 2)

In this article, I present an experiment using one query for two different designs in MongoDB, with...

https://dev.to/hoangng/fundamentals-of-mongodb-part-2-4bh8

In this article, I present an experiment using one query for two different designs in MongoDB, with one having a significant reduction in the workload compared to the other. In other words, the query is exactly the same; however, using some optimizing techniques in the database can make a significant difference. The system went from scanning 1,000,000 documents to only 2651 documents to complete the same task. The article also notes that understanding the business use case is the key. To replicate this experiment, some basic knowledge is required to install MongoDB tools such as MongoDB Shell or MongoDB Compass to connect your local machine to your MongoDB, or it is fine to use MongoDB locally. ## Data simulation First of all, we need some data. Therefore, I have some code to simulate a collection of 1,000,000 customers, as shown below. After running the simulation code, it creates a collection named "customers" containing 1,000,000 documents with the fields of name, age, address, email, phone number, and profession. ``` // create a function to generate random customers function generateRandomCustomer() { const specificNames = ["A1", "A2", "A3", "A4", "A5", "A6", "A7", "A8"]; const professions = ["B1", "B2", "B3", "B4", "B5", "B6", "B7", "B8"]; const randomName = specificNames[Math.floor(Math.random() * specificNames.length)]; const randomAge = Math.floor(Math.random() * 50 + 20); const randomAddress = "Address" + Math.floor(Math.random() * 1000); const randomEmail = randomName.toLowerCase() + "@email.com"; const randomPhoneNumber = "123-456-789"; const randomProfession = professions[Math.floor(Math.random() * professions.length)]; return { name: randomName, age: randomAge, address: randomAddress, email: randomEmail, phoneNumber: randomPhoneNumber, profession: randomProfession }; } // simulate 1000000 customers const countDocuments = 1000000 const randomCustomers = []; for (let i = 0; i < countDocuments; i++) { randomCustomers.push(generateRandomCustomer()); } // insert the customers to the database using a batch size of 10000 const batchSize = 10000; for (let i = 0; i < randomCustomers.length; i += batchSize) { const batch = randomCustomers.slice(i, i + batchSize); db.customers.insertMany(batch); } ``` There is one note about the batch size in the simulation code. To insert a large number of data into the database, we need to divide the whole dataset into smaller batches for efficiency, and I chose a batch size of 10,000 for this experiment. ## Overview of the data Use the following command in MongoDB Shell to view the example of one document. ``` db.customers.findOne() { _id: ObjectId('6684b910294f269e10fd8498'), name: 'A7', age: 29, address: 'Address438', email: '[email protected]', phoneNumber: '123-456-789', profession: 'B3' } ``` Check the number of documents ``` db.customers.countDocuments() 1000000 ``` We are sure that we have a collection of 1,000,000 customers with their information. ## Experiment Imagine if I need to find a customer named "A1" and the age of 36. In a real-world use case, it could be a task to query all transactions, given the customer's name and the date. The query is as follows. ``` Atlas atlas-4gwxni-shard-0 [primary] justatest> db.customers.find({name:"A1", age:36}) [ { _id: ObjectId('6684b910294f269e10fd84aa'), name: 'A1', age: 36, address: 'Address534', email: '[email protected]', phoneNumber: '123-456-789', profession: 'B5' }, ... { _id: ObjectId('6684b910294f269e10fd85ff'), name: 'A1', age: 36, address: 'Address802', email: '[email protected]', phoneNumber: '123-456-789', profession: 'B3' }, ``` In my experiment, it returns 2561 results. It is noted that the simulation is random; therefore, the number of results could be different between different trials. ## Cost examination Now, it comes to the interesting part when I check the workload the system needs to do to implement the query. To do that, I use the command "explain()" as shown below. ``` db.customers.find({name:"A1", age:36}).explain("executionStats"); ``` The output is lengthy. Therefore, I only focus on the important lines. ``` totalKeysExamined: 0, totalDocsExamined: 1000000, executionStages: { stage: 'COLLSCAN', filter: { '$and': [ { age: { '$eq': 36 } }, { name: { '$eq': 'A1' } } ] }, nReturned: 2561, executionTimeMillisEstimate: 455, ``` The output above shows that the system must go through 1,000,000 documents to complete the work (i.e., returning 2561 results). The reason is that the algorithm used to implement the query is "COLLSCAN." It simply means that the system must scan the entire collection to complete the work. Another way to view the cost is to click the "explain" button in the MongoDB Compass.  ## Database optimization The workload seems to be heavy. Introducing indexes to the database is a commonly used technique to reduce the workload. We can do that using the command "createIndex()". ``` db.customers.createIndex({name: 1, age: 1}, {name: "IDX_NAME_AGE"}); IDX_NAME_AGE ``` What the command does is it creates indexes for the fields of name and age. We can check the indexes as follows. ``` db.customers.getIndexes(); [ { v: 2, key: { _id: 1 }, name: '_id_' }, { v: 2, key: { name: 1, age: 1 }, name: 'IDX_NAME_AGE' } ] ``` ## Querying after optimization The next step is to use the "explain" command to check the workload required to complete the same query. ``` db.customers.find({name:"A1", age:36}).explain("executionStats"); ``` Output ``` winningPlan: { stage: 'FETCH', inputStage: { stage: 'IXSCAN', ... totalKeysExamined: 2561, totalDocsExamined: 2561, executionStages: { ... nReturned: 2561, executionTimeMillisEstimate: 6, ``` The output demonstrates that the workload gets significantly reduced. The system went from scanning the entire 1,000,000 documents to only scanning 2561 documents. It might be observed that the execution time drops significantly; however, the execution time can vary a lot depending on the physical machine. Therefore, I only want to draw your attention to the workload. ## Important notes As presented above, using indexes can be very helpful. However, the mechanism behind introducing indexes is that the database creates a smaller table and sorts all the data into order. The simple imagination is that you have a line of 1 million people of different ages and names. The task is to find people with names such as "A1" and the age of 36. The only way to complete the task is to come over and ask everyone making up the workload to ask 1,000,000 times. However, if you have sorted the people in the line by their names and ages, it becomes much easier to find the expected ones. The database creates a smaller table with sorted information. It physically takes up some space in your storage; creating redundant indexes might not be considered a good practice. It, therefore, highlights the importance of understanding the business. Certain fields might be used for querying much more often than others in a specific use case of a business. Those often-used data must be prioritized when designing database configuration, while the not-frequently-used ones can be treated differently. There is still much more to mention about indexing, partitioning and other techniques and strategies for database optimization. I believe that understanding those things would be significantly beneficial for developers. Thank you for reading this far! Have a nice day Hoang P/S: I will come back to this topic for another experiment.

hoangng

BEWARE OF THE PITFALLS OF THE CRYPTO WORLD , HIRE FAST SWIFT CYBER SERVICES .

BEWARE OF THE PITFALLS OF THE CRYPTO WORLD , HIRE FAST SWIFT CYBER SERVICES . I fell victim to a...

https://dev.to/helena_gary_b3feb804bb57d/beware-of-the-pitfalls-of-the-crypto-world-hire-fast-swift-cyber-services--5bnh

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helena_gary_b3feb804bb57d

Entity Framework Core advanced concepts

Best Practices for Designing and Handling Relationships in Entity Framework Core ...

https://dev.to/muhammad_salem/entity-framework-core-advanced-concepts-2lm9

# Best Practices for Designing and Handling Relationships in Entity Framework Core ## Introduction Entity Framework Core (EF Core) is a powerful Object-Relational Mapping (ORM) tool that simplifies database operations in .NET applications. One of its key strengths lies in its ability to model and manage relationships between entities. Understanding how to design and handle these relationships effectively is crucial for creating robust, efficient, and maintainable applications. This guide will explore best practices for working with entity relationships in EF Core, covering everything from basic concepts to advanced techniques. Whether you're new to EF Core or looking to optimize your existing data models, this resource will provide valuable insights and practical advice. ## Types of Relationships in Entity Framework Core Before diving into best practices, it's essential to understand the different types of relationships that can exist between entities. EF Core supports three primary types of relationships: 1. One-to-One (1:1) 2. One-to-Many (1:N) 3. Many-to-Many (M:N) Let's explore each of these in detail: ### One-to-One (1:1) Relationships A one-to-one relationship exists when each record in one entity is associated with exactly one record in another entity, and vice versa. Example scenario: A User entity has one UserProfile entity, and each UserProfile belongs to one User. ```csharp public class User { public int Id { get; set; } public string Username { get; set; } public UserProfile Profile { get; set; } } public class UserProfile { public int Id { get; set; } public int UserId { get; set; } public string FullName { get; set; } public User User { get; set; } } ``` ### One-to-Many (1:N) Relationships In a one-to-many relationship, a record in one entity can be associated with multiple records in another entity, but each of those records is associated with only one record in the first entity. Example scenario: An Order entity can have multiple OrderItem entities, but each OrderItem belongs to only one Order. ```csharp public class Order { public int Id { get; set; } public DateTime OrderDate { get; set; } public List<OrderItem> Items { get; set; } } public class OrderItem { public int Id { get; set; } public int OrderId { get; set; } public string ProductName { get; set; } public int Quantity { get; set; } public Order Order { get; set; } } ``` ### Many-to-Many (M:N) Relationships A many-to-many relationship occurs when multiple records in one entity can be associated with multiple records in another entity. Example scenario: A Student entity can be enrolled in multiple Course entities, and each Course can have multiple Students. ```csharp public class Student { public int Id { get; set; } public string Name { get; set; } public List<Enrollment> Enrollments { get; set; } } public class Course { public int Id { get; set; } public string Title { get; set; } public List<Enrollment> Enrollments { get; set; } } public class Enrollment { public int StudentId { get; set; } public Student Student { get; set; } public int CourseId { get; set; } public Course Course { get; set; } public DateTime EnrollmentDate { get; set; } } ``` In this example, we've introduced an `Enrollment` entity to represent the many-to-many relationship between `Student` and `Course`. This is known as a join entity or junction table. ## Understanding Cardinalities and Data Integrity When designing relationships, it's crucial to understand the concept of cardinality and its impact on data integrity. Cardinality refers to the number of instances of one entity that can be associated with the number of instances of another entity. It's perfectly acceptable to omit the navigation property from Product to CartItem if you don't need it. It's often a good practice to include only the navigation properties that your application requires. This approach can lead to a cleaner, more maintainable codebase and can potentially improve performance by reducing unnecessary data loading. Let's review this code: ```csharp modelBuilder.Entity<CartItem>() .HasOne(ci => ci.Product) .HasForeignKey(ci => ci.ProductId) .OnDelete(DeleteBehavior.NoAction); ``` This configuration is correct and sufficient for establishing a relationship between CartItem and Product entities. Here's what it does: 1. It specifies that each CartItem is associated with one Product. 2. It sets up a foreign key relationship using the ProductId property in CartItem. 3. It configures the delete behavior to NoAction, meaning that deleting a Product won't automatically affect related CartItems. This configuration allows you to navigate from CartItem to Product, but not vice versa. This is often the desired behavior in e-commerce scenarios where you want to know which product is in a cart, but you don't necessarily need to know all the cart items for a given product. Benefits of this approach: 1. Simplified model: Your Product entity remains focused on product-specific properties without the added complexity of cart-related navigation. 2. Reduced risk of circular references: By having only one-way navigation, you reduce the risk of creating circular references in your object graph. 3. Performance: When loading Product entities, EF Core won't try to load related CartItems unless explicitly told to do so, which can improve performance. 4. Clearer domain boundaries: This approach respects the natural boundary between products and shopping carts in your domain model. If you later find that you do need to access CartItems from Product in some scenarios, you can always add the navigation property and update your configuration. But if you don't need it, leaving it out is a perfectly valid and often preferred approach. Key points to consider: 1. **Required vs. Optional Relationships**: Determine whether a relationship is required (e.g., an Order must have at least one OrderItem) or optional (e.g., a User may or may not have a UserProfile). 2. **Cascading Behaviors**: Decide how related entities should be affected when a parent entity is deleted or updated. EF Core provides options like Cascade, SetNull, Restrict, and NoAction. 3. **Referential Integrity**: Ensure that relationships between tables are consistent and that foreign key constraints are properly enforced. Example of configuring a required relationship with cascading delete: ```csharp protected override void OnModelCreating(ModelBuilder modelBuilder) { modelBuilder.Entity<Order>() .HasMany(o => o.Items) .WithOne(i => i.Order) .IsRequired() .OnDelete(DeleteBehavior.Cascade); } ``` By carefully considering these aspects, you can create a data model that accurately represents your domain and maintains data integrity. ## Configuring Relationships: Conventions vs. Fluent API EF Core provides two main approaches for configuring entity relationships: conventions and the Fluent API. Let's explore both: ### Conventions EF Core follows a set of conventions to automatically infer relationships based on your entity classes. These conventions can simplify your code and reduce the amount of configuration needed. Key conventions for relationships: 1. **Navigation properties**: EF Core recognizes navigation properties and creates relationships based on them. 2. **Foreign key properties**: If you include a property named `<NavigationPropertyName>Id`, EF Core will recognize it as a foreign key. 3. **Collection navigation properties**: Properties of type `ICollection<T>`, `List<T>`, or similar are treated as collection navigation properties. Example of a relationship configured by convention: ```csharp public class Blog { public int Id { get; set; } public string Url { get; set; } public List<Post> Posts { get; set; } } public class Post { public int Id { get; set; } public string Title { get; set; } public int BlogId { get; set; } public Blog Blog { get; set; } } ``` In this example, EF Core will automatically recognize the one-to-many relationship between `Blog` and `Post` based on the navigation properties and the `BlogId` foreign key. ### Fluent API While conventions are powerful, sometimes you need more control over how relationships are configured. The Fluent API provides a way to configure your model using C# code, offering more flexibility and power than conventions or data annotations. Example of configuring a relationship using Fluent API: ```csharp protected override void OnModelCreating(ModelBuilder modelBuilder) { modelBuilder.Entity<Post>() .HasOne(p => p.Blog) .WithMany(b => b.Posts) .HasForeignKey(p => p.BlogId) .IsRequired(); } ``` The Fluent API is particularly useful for: - Configuring relationships when you can't modify entity classes - Setting up complex relationships or constraints - Overriding conventions when needed - Configuring database-specific features Best practice tip: Use conventions for simple, straightforward relationships, and resort to the Fluent API for more complex scenarios or when you need fine-grained control. ## Handling Complex Relationships ### Many-to-Many Relationships with Extra Data In real-world scenarios, many-to-many relationships often require additional data about the relationship itself. For example, consider a system where Users can be members of multiple Teams, but we also need to track their role within each team. ```csharp public class User { public int Id { get; set; } public string Name { get; set; } public List<UserTeam> UserTeams { get; set; } } public class Team { public int Id { get; set; } public string Name { get; set; } public List<UserTeam> UserTeams { get; set; } } public class UserTeam { public int UserId { get; set; } public User User { get; set; } public int TeamId { get; set; } public Team Team { get; set; } public string Role { get; set; } public DateTime JoinDate { get; set; } } ``` Configure this relationship using Fluent API: ```csharp protected override void OnModelCreating(ModelBuilder modelBuilder) { modelBuilder.Entity<UserTeam>() .HasKey(ut => new { ut.UserId, ut.TeamId }); modelBuilder.Entity<UserTeam>() .HasOne(ut => ut.User) .WithMany(u => u.UserTeams) .HasForeignKey(ut => ut.UserId); modelBuilder.Entity<UserTeam>() .HasOne(ut => ut.Team) .WithMany(t => t.UserTeams) .HasForeignKey(ut => ut.TeamId); } ``` ### Self-Referencing Relationships Self-referencing relationships occur when an entity has a relationship with itself. A common example is a hierarchical structure, like an employee-manager relationship. ```csharp public class Employee { public int Id { get; set; } public string Name { get; set; } public int? ManagerId { get; set; } public Employee Manager { get; set; } public List<Employee> DirectReports { get; set; } } ``` Configure this relationship: ```csharp protected override void OnModelCreating(ModelBuilder modelBuilder) { modelBuilder.Entity<Employee>() .HasOne(e => e.Manager) .WithMany(e => e.DirectReports) .HasForeignKey(e => e.ManagerId) .IsRequired(false) .OnDelete(DeleteBehavior.Restrict); } ``` ### Polymorphic Associations (Table-per-Hierarchy) Sometimes, you need to model inheritance hierarchies in your database. EF Core supports several inheritance mapping strategies, including Table-per-Hierarchy (TPH). ```csharp public abstract class Payment { public int Id { get; set; } public decimal Amount { get; set; } } public class CreditCardPayment : Payment { public string CardNumber { get; set; } } public class PayPalPayment : Payment { public string EmailAddress { get; set; } } ``` Configure TPH: ```csharp protected override void OnModelCreating(ModelBuilder modelBuilder) { modelBuilder.Entity<Payment>() .HasDiscriminator<string>("PaymentType") .HasValue<CreditCardPayment>("CreditCard") .HasValue<PayPalPayment>("PayPal"); } ``` ## Advanced Navigation Property Techniques ### Lazy Loading Lazy loading allows navigation properties to be loaded automatically when accessed. While it can be convenient, it should be used cautiously to avoid performance issues. To enable lazy loading: 1. Install the Microsoft.EntityFrameworkCore.Proxies package. 2. Configure lazy loading in your DbContext: ```csharp protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder) { optionsBuilder.UseLazyLoadingProxies().UseSqlServer(connectionString); } ``` 3. Make navigation properties virtual: ```csharp public class Blog { public int Id { get; set; } public virtual ICollection<Post> Posts { get; set; } } ``` ### Eager Loading For better performance in scenarios where you know you'll need related data, use eager loading: ```csharp var blogs = context.Blogs .Include(b => b.Posts) .ThenInclude(p => p.Author) .ToList(); ``` ### Explicit Loading Load related entities on-demand: ```csharp var blog = context.Blogs.First(); context.Entry(blog) .Collection(b => b.Posts) .Load(); ``` ## Maintaining Clean and Efficient Database Schema ### Use of Value Conversions Value conversions allow you to map between property values and database values. This can be useful for storing enums as strings, encrypting data, or handling custom types. ```csharp public enum Status { Active, Inactive } public class User { public int Id { get; set; } public Status Status { get; set; } } protected override void OnModelCreating(ModelBuilder modelBuilder) { modelBuilder.Entity<User>() .Property(u => u.Status) .HasConversion( v => v.ToString(), v => (Status)Enum.Parse(typeof(Status), v)); } ``` ### Shadow Properties Shadow properties are properties that are not defined in your entity class but are part of the model and mapped to the database. They're useful for storing metadata without cluttering your domain model. ```csharp protected override void OnModelCreating(ModelBuilder modelBuilder) { modelBuilder.Entity<Blog>() .Property<DateTime>("LastUpdated"); } // Usage var blog = context.Blogs.First(); context.Entry(blog).Property("LastUpdated").CurrentValue = DateTime.Now; ``` ### Owned Entity Types Owned entity types allow you to model complex types as part of your entity, mapping to the same table but providing better encapsulation. ```csharp public class Order { public int Id { get; set; } public ShippingAddress ShippingAddress { get; set; } } [Owned] public class ShippingAddress { public string Street { get; set; } public string City { get; set; } public string Country { get; set; } } ``` ## Performance Optimization Techniques ### Splitting Queries For complex queries that include multiple collections, split the query to avoid cartesian explosion: ```csharp var blogs = context.Blogs .AsSplitQuery() .Include(b => b.Posts) .Include(b => b.Owner) .ToList(); ``` ### Compiled Queries For frequently executed queries, use compiled queries to improve performance: ```csharp private static Func<BloggingContext, int, Blog> _getBlogById = EF.CompileQuery((BloggingContext context, int id) => context.Blogs.Include(b => b.Posts).FirstOrDefault(b => b.Id == id)); // Usage var blog = _getBlogById(context, 1); ``` ### Batch Updates and Deletes For bulk operations, consider using third-party libraries like EFCore.BulkExtensions to perform batch updates or deletes: ```csharp context.BulkUpdate(entities); context.BulkDelete(entitiesToDelete); ``` ## Real-World Example: Content Management System Let's tie these concepts together with a real-world example of a simple content management system: ```csharp public class Site { public int Id { get; set; } public string Name { get; set; } public List<Page> Pages { get; set; } public List<User> Users { get; set; } } public class Page { public int Id { get; set; } public string Title { get; set; } public string Content { get; set; } public int SiteId { get; set; } public Site Site { get; set; } public List<PageVersion> Versions { get; set; } public List<PagePermission> Permissions { get; set; } } public class PageVersion { public int Id { get; set; } public int PageId { get; set; } public Page Page { get; set; } public string Content { get; set; } public DateTime CreatedAt { get; set; } } public class User { public int Id { get; set; } public string Username { get; set; } public List<Site> Sites { get; set; } public List<PagePermission> PagePermissions { get; set; } } public class PagePermission { public int UserId { get; set; } public User User { get; set; } public int PageId { get; set; } public Page Page { get; set; } public PermissionLevel Level { get; set; } } public enum PermissionLevel { Read, Edit, Publish } public class CMSContext : DbContext { public DbSet<Site> Sites { get; set; } public DbSet<Page> Pages { get; set; } public DbSet<PageVersion> PageVersions { get; set; } public DbSet<User> Users { get; set; } public DbSet<PagePermission> PagePermissions { get; set; } protected override void OnModelCreating(ModelBuilder modelBuilder) { modelBuilder.Entity<PagePermission>() .HasKey(pp => new { pp.UserId, pp.PageId }); modelBuilder.Entity<PagePermission>() .Property(pp => pp.Level) .HasConversion( v => v.ToString(), v => (PermissionLevel)Enum.Parse(typeof(PermissionLevel), v)); modelBuilder.Entity<Site>() .HasMany(s => s.Users) .WithMany(u => u.Sites) .UsingEntity<Dictionary<string, object>>( "SiteUser", j => j.HasOne<User>().WithMany().HasForeignKey("UserId"), j => j.HasOne<Site>().WithMany().HasForeignKey("SiteId")); modelBuilder.Entity<Page>() .HasOne(p => p.Site) .WithMany(s => s.Pages) .HasForeignKey(p => p.SiteId) .OnDelete(DeleteBehavior.Cascade); modelBuilder.Entity<PageVersion>() .HasOne(pv => pv.Page) .WithMany(p => p.Versions) .HasForeignKey(pv => pv.PageId) .OnDelete(DeleteBehavior.Cascade); modelBuilder.Entity<Page>() .Property<DateTime>("LastUpdated"); } } ``` This example demonstrates: - One-to-many relationships (Site to Pages, Page to PageVersions) - Many-to-many relationships (Users to Sites, Users to Pages through PagePermissions) - Enum conversion (PermissionLevel) - Shadow property (LastUpdated on Page) - Cascade delete behavior To use this model effectively: 1. Eager load related data when querying pages: ```csharp var pages = context.Pages .Include(p => p.Site) .Include(p => p.Versions) .Include(p => p.Permissions) .ThenInclude(pp => pp.User) .ToList(); ``` 2. Implement a service to handle page updates, ensuring versions are created: ```csharp public async Task UpdatePage(int pageId, string newContent, int userId) { var page = await context.Pages.FindAsync(pageId); var userPermission = await context.PagePermissions .FirstOrDefaultAsync(pp => pp.PageId == pageId && pp.UserId == userId); if (userPermission?.Level != PermissionLevel.Edit) throw new UnauthorizedAccessException(); var newVersion = new PageVersion { PageId = pageId, Content = page.Content, CreatedAt = DateTime.UtcNow }; page.Content = newContent; context.Entry(page).Property("LastUpdated").CurrentValue = DateTime.UtcNow; context.PageVersions.Add(newVersion); await context.SaveChangesAsync(); } ``` 3. Optimize queries for listing pages with permissions: ```csharp var pagesWithPermissions = await context.Pages .Where(p => p.SiteId == siteId) .Select(p => new { Page = p, Permissions = p.Permissions.Select(pp => new { UserId = pp.UserId, Username = pp.User.Username, PermissionLevel = pp.Level }).ToList() }) .AsSplitQuery() .ToListAsync(); ``` This comprehensive example showcases how to design and implement a flexible, performant data model for a content management system using Entity Framework Core. It incorporates many of the advanced concepts and best practices we've discussed, providing a solid foundation for building complex, real-world applications.

muhammad_salem

Thiết Kế Website Phòng Gym – Thể Hình Chuyên Nghiệp

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terus_technique

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https://dev.to/terus_technique/xampp-la-gi-cach-dung-xampp-giup-viec-code-nhanh-hon-f8e

website, digitalmarketing, seo, terus

 XAMPP là một trong những công cụ phổ biến nhất để tạo môi trường giả lập server hosting và được sử dụng rộng rãi trên toàn cầu hiện nay. Để giúp bạn dễ dàng sử dụng và trải nghiệm phần mềm này, bài viết này sẽ giải thích các khái niệm cơ bản về XAMPP cũng như cách cài đặt và sử dụng nó. Hiện nay, XAMPP là một công cụ phổ biến và được nhiều lập trình viên ưa chuộng để hoàn thành các sản phẩm của họ. XAMPP được sử dụng để [xây dựng và phát triển website](https://terusvn.com/thiet-ke-website-tai-hcm/) sử dụng ngôn ngữ PHP. Ngoài ra, phát triển và nghiên cứu website trên máy tính cá nhân tại localhost. Điều này cho phép biến máy tính cá nhân thành máy chủ và sử dụng ổ cứng máy tính để lưu trữ cho máy chủ website. XAMPP không thể được sử dụng cho các website kinh doanh cần vận hành liên tục. Do localhost sử dụng máy tính để làm máy chủ, việc duy trì máy chủ không đảm bảo tốc độ và khó khăn trong hoạt động là nguyên nhân. Các chủ website sẽ thuê server hosting riêng cho các loại hình này. XAMPP được thiết kế để đa nền tảng và hỗ trợ nhiều hệ điều hành khác nhau, bao gồm Windows, macOS, Linux và Solaris. Nó cung cấp một môi trường phát triển nhất quán trên các nền tảng này, cho phép các nhà phát triển làm việc trên các dự án của họ bất kể hệ điều hành họ đang sử dụng. XAMPP chủ yếu dành cho mục đích phát triển và thử nghiệm hơn là môi trường sản xuất. Mặc dù nó cung cấp một cách dễ dàng để thiết lập môi trường máy chủ cục bộ nhưng nó có thể không có cùng mức độ bảo mật và tối ưu hóa hiệu suất như các thiết lập máy chủ sản xuất chuyên dụng. Bạn nên sử dụng phần mềm này để phát triển và thử nghiệm cục bộ, đồng thời khi [triển khai website](https://terusvn.com/thiet-ke-website-tai-hcm/) hoặc ứng dụng web vào môi trường sản xuất trực tiếp, hãy cân nhắc sử dụng thiết lập máy chủ chuyên dụng được thiết kế riêng cho mục đích sử dụng sản xuất. Tìm hiểu thêm về [XAMPP Là Gì? Cách Dùng XAMPP Giúp Việc Code Nhanh Hơn](https://terusvn.com/thiet-ke-website/xampp-la-gi-cach-dung-xampp/) Digital Marketing: · [Dịch vụ Facebook Ads](https://terusvn.com/digital-marketing/dich-vu-facebook-ads-tai-terus/) · [Dịch vụ Google Ads](https://terusvn.com/digital-marketing/dich-vu-quang-cao-google-tai-terus/) · [Dịch vụ SEO Tổng Thể](https://terusvn.com/seo/dich-vu-seo-tong-the-uy-tin-hieu-qua-tai-terus/) Thiết kế website: · [Dịch vụ Thiết kế website chuẩn Insight](https://terusvn.com/thiet-ke-website/dich-vu-thiet-ke-website-chuan-insight-chuyen-nghiep-uy-tin-tai-terus/) · [Dịch vụ Thiết kế website](https://terusvn.com/thiet-ke-website-tai-hcm/)

terus_technique

Build an AI UI Generator with Gemini API, Next.js (Tutorial)

In this tutorial, we will build an AI UI Generator using Next.js and the Gemini API. It is...

https://avionmission.com/blog/gemini-nextjs-generative-ui-tutorial/

gemini, nextjs, openai, frontend

{% embed https://www.youtube.com/watch?v=IFQI3t89eO8 %} In this tutorial, we will build an AI UI Generator using Next.js and the Gemini API. It is similar to [v.0 by Vercel](https://v0.dev/) which allows you to generate UI with a simple prompt and use it in your web apps. This type of dynamic code generation can be the beginning of a new paradigm in software development where User Interfaces are generated by AI according to user's needs. This concept is being termed as "Generative UI". Here's an example of how our application will work:  Let's begin by creating a new Next.js project. ### Step 1: Create a new Next.js project ```bash npx [email protected] ui-generator ``` You will be prompted to select settings for the new project, make sure to follow these choices: * For TypeScript, select **No** because this tutorial uses JavaScript. * Feel free to choose any option for enabling ESLint. * Choose **Yes** for Tailwind CSS. * Exclude the *src/* directory by selecting **No**, which is the default option. * Enable App Router by selecting **Yes**, which is the recommended option. * Lastly, select **No** for `import alias` configuration. Change the working directory to your new Next.js project, *ui-generator* and run the application to make sure everything is fine: ```bash cd ui-generator npx run dev ``` ### Step 2: Building the Frontend In the new app router in Next.js, `app/page.js` hosts the code for the home page. Remove everything inside it apart from the outer `div`s, and now we have an empty canvas to create anything we want. Create a simple interface for this application which includes an input box to enter a prompt, a `div` placeholder for the code to be generated, and button to copy code: ```javascript 'use client' export default function Home() { return ( <main className="flex min-h-screen flex-col items-center p-12"> <div className="max-w-5xl w-full flex-col items-center justify-center text-sm lg:flex"> <p className='text-3xl mb-4 font-bold text-gray-600'>UI Generator</p> <div className="relative flex items-center w-full h-12 rounded-lg focus-within:shadow-md bg-transparent overflow-hidden"> <input className="peer h-full w-full outline-none bg-gray-100 text-sm text-gray-700 pl-4 pr-12" type="text" placeholder="Enter a prompt..." /> <div onClick={handleGenerate} className="absolute right-0 flex items-center justify-center h-full w-12 bg-blue-500 hover:bg-blue-600 text-white cursor-pointer"> <p className='text-2xl'>➔</p> </div> </div> <div className='flex'> <button className='bg-blue-500 text-white px-5 py-3 mt-7 hover:bg-blue-600 m-2' onClick={handleCopy}>Copy Code</button> </div> <div className='bg-transparent border-2 border-gray-300 rounded mt-7 p-2 flex justify-center'> {/* Generated code */} </div> </div> </main> ) } ``` ### Step 3: Obtain the Gemini API Key Before we start working on our back-end of the application, we need to obtain the Gemini API key to be able to leverage Google's generative AI tools. Go to [https://ai.google.dev/aistudio](https://ai.google.dev/aistudio) to get the Gemini API key for free. Create a `.env` file in the root of your project and store your API key: ```json GEMINI_API_KEY=[YOUR API KEY] ``` ### Step 4: Create server-side function to handle POST Requests Install the Google AI JavaScript SDK enables you to use Google's generative AI models. Make sure you are in your project's root directory and run the following command in your terminal: ```bash npm install @google/generative-ai ``` In Next.js app router, you can define custom route handlers in `route.js` file inside the app director. For example the file `app/api/generate/route.js` maps to `/api/generate` route. Let's create a function to handle POST requests in `/api/generate/route.js` : ```javascript import { GoogleGenerativeAI } from '@google/generative-ai'; import { NextResponse } from 'next/server'; export async function POST(req, res) { const genAI = new GoogleGenerativeAI(process.env.GEMINI_API_KEY) try { const model = genAI.getGenerativeModel({ model: "gemini-pro" }); const data = await req.json() const prompt = data.body + ". Write jsx code and use tailwindcss for modern UI. Don't make any imports. Only output code."; const result = await model.generateContent(prompt); const response = await result.response; const code = await response.text() return NextResponse.json({code: code}) } catch (error) { console.error(error) } } ``` Here, we create an instance of `GoogleGenerativeAI` from the API key we stored in the `.env` file, define a model that uses `gemini-pro` model. We retrieve the JSON data from the request body and store it in a variable `data`. But we don't directly pass it as a prompt to the Gemini API. Instead, we add some "prompt injection", i.e. additional instruction for the AI model so that we can have control over the output we get. Then we pass the prompt to Gemini using the `generateContent()` method. Finally we pass the generated output as a JSON response object. ### Step 5: Create a client side function to handle POST request First, we will define two state variables in our home page `page.js` : ```javascript const [prompt, setPrompt] = useState(''); const [code, setCode] = useState(''); ``` Set an `onChange` listener to bind the state variable `prompt` to the input text: ```javascript <input className="peer h-full w-full outline-none bg-gray-100 text-sm text-gray-700 pl-4 pr-12" type="text" value={prompt} onChange={(e) => setPrompt(e.target.value)} placeholder="Enter a prompt..." /> ``` Create a function called `handleGenerate()` above the return function: ```javascript const handleGenerate = async () => { try { const response = await fetch('/api/generate', { method: 'POST', headers: { 'Content-Type': 'application/json', }, body: JSON.stringify({ body: prompt }) }); const data = await response.json(); if (response.ok) { setCode(data.code); } else { console.error(data.error); } } catch (error) { console.error('Error:', error); } }; ``` This function initiates an HTTP POST request to the endpoint `/api/generate` using the `fetch` function. It sends the prompt as a request object. Set an `onClick` listener in your send button to execute the `handleGenerate` function: ```javascript <div onClick={handleGenerate} className="absolute right-0 flex items-center justify-center h-full w-12 bg-blue-500 hover:bg-blue-600 text-white cursor-pointer"> <p className='text-2xl'>➔</p> </div> ``` We need to display the code which is stored in the `code` state variable somewhere: ```javascript <div className='bg-transparent rounded mt-7 p-2 flex justify-center'> {code} </div> ``` Now test the application by running `npm run dev` and test the application by entering a prompt such as "create a pricing section for my website". ### Step 6: Rendering Generated JSX Code Now the final piece of the puzzle is rendering the generated code into user interface instead of just displaying the code. For that, we will use a library called `html-react-parser` . Open a new terminal, change directory to the root of your project and run: ```bash npm install html-react-parser ``` To use `html-react-parser` , in your `page.js` make the following import: ```javascript import parser from 'html-react-parser'; ``` Now use the `parse` method to convert String into JSX code: ```javascript <div className='bg-transparent rounded mt-7 p-2 flex justify-center'> {parse(code)} </div> ``` ### Step 7: Function to Copy code You can write a function to copy code: ```javascript const handleCopy = async () => { try { await navigator.clipboard.writeText(code); alert("Code copied to clipboard") } catch (err) { console.error('Failed to copy: ', err) } } ``` It uses the `navigator.clipboard.writeText` method to write the text stored in the variable `code` to the system clipboard. ### Wrapping Up You can get the full code for this project at the github repo: [https://github.com/avionmission/ui-generator](https://github.com/avionmission/ui-generator)

avionmission

Cpanel Và Những Gì Bạn Cần Biết

cPanel là một giao diện web điều khiển dành cho người quản trị web hosting. Nó cung cấp một loạt các...

https://dev.to/terus_technique/cpanel-va-nhung-gi-ban-can-biet-1ph1

website, digitalmarketing, seo, terus

 cPanel là một giao diện web điều khiển dành cho người [quản trị web hosting](https://terusvn.com/thiet-ke-website-tai-hcm/). Nó cung cấp một loạt các công cụ và tính năng để quản lý các website, email, cơ sở dữ liệu và nhiều thứ khác trong khoảng thời gian lưu trữ của một website. Nó cho phép người dùng thực hiện các tác vụ quản lý hosting một cách dễ dàng và hiệu quả như: Quản lý tệp và thư mục Quản lý tên miền và DNS Quản lý email Quản lý cơ sở dữ liệu Xem số liệu và phân tích website Bảo mật và sao lưu dữ liệu Cài đặt phần mềm và tập lệnh Quản lý FTP và sao lưu tệp Tích hợp Subversion và Git Tùy chỉnh và xây dựng thương hiệu Một số ưu điểm chính của cPanel bao gồm: Giao diện thân thiện với người dùng Đa dạng các tính năng và công cụ quản lý Tiết kiệm thời gian và công sức Tích hợp với các dịch vụ bên thứ ba Khả năng tự động hóa và viết tập lệnh Tuy nhiên, cPanel cũng có một số hạn chế như: Chi phí sử dụng Sử dụng nhiều tài nguyên máy chủ Khả năng tùy chỉnh hạn chế Độ phức tạp đối với người dùng nâng cao Phụ thuộc vào nhà cung cấp cPanel là một công cụ quản lý hosting phổ biến và mạnh mẽ, cung cấp nhiều tính năng tiện ích cho người [quản trị website](https://terusvn.com/thiet-ke-website-tai-hcm/). Nó giúp tiết kiệm thời gian và công sức, đồng thời cũng có một số hạn chế về chi phí, tài nguyên và tùy chỉnh. Việc lựa chọn sử dụng cPanel hay không còn tùy thuộc vào nhu cầu và điều kiện của mỗi website. Tìm hiểu thêm về [Cpanel Và Những Gì Bạn Cần Biết](https://terusvn.com/thiet-ke-website/cpanel-la-gi/) Digital Marketing: · [Dịch vụ Facebook Ads](https://terusvn.com/digital-marketing/dich-vu-facebook-ads-tai-terus/) · [Dịch vụ Google Ads](https://terusvn.com/digital-marketing/dich-vu-quang-cao-google-tai-terus/) · [Dịch vụ SEO Tổng Thể](https://terusvn.com/seo/dich-vu-seo-tong-the-uy-tin-hieu-qua-tai-terus/) Thiết kế website: · [Dịch vụ Thiết kế website chuẩn Insight](https://terusvn.com/thiet-ke-website/dich-vu-thiet-ke-website-chuan-insight-chuyen-nghiep-uy-tin-tai-terus/) · [Dịch vụ Thiết kế website](https://terusvn.com/thiet-ke-website-tai-hcm/)

terus_technique

افضل شركة تنظيف مكيفات بالرياض

ركين لايت: أفضل شركة تنظيف مكيفات بالرياض تعتبر شركة ركين لايت من الشركات الرائدة في تقديم...

https://dev.to/raqin_company_63e7d5d7ef7/fdl-shrk-tnzyf-mkyft-blryd-5epj

cleancoding, air

## ركين لايت: أفضل شركة تنظيف مكيفات بالرياض تعتبر شركة ركين لايت من الشركات الرائدة في تقديم خدمات [تنظيف مكيفات بالرياض](https://raqein.com/air-conditioner-cleaning-company-in-riyadh/). نحن نفخر بتقديم خدمات متميزة وعالية الجودة تضمن لك ولأسرتك بيئة صحية ونقية. بفضل فريقنا المتخصص وأحدث التقنيات المستخدمة، نضمن لك تنظيفاً شاملاً وعميقاً لمكيفاتك. **شركة تنظيف مكيفات بالرياض** نحن في شركة ركين لايت ندرك أهمية المكيفات في توفير الهواء النقي والمنعش في منزلك، وخاصة في فصل الصيف الحار. لذلك، نقدم خدمات تنظيف مكيفات شاملة ودقيقة تضمن لك أداءً ممتازاً لمكيفاتك طوال العام. خدماتنا تشمل: - تنظيف شامل لجميع أنواع المكيفات: نحن نتعامل مع جميع أنواع المكيفات، سواء كانت مكيفات سبليت، شباك، أو مركزية، ونضمن لك تنظيفاً فعالاً يعيد لمكيفاتك كفاءتها. - استخدام مواد تنظيف آمنة: نستخدم مواد تنظيف آمنة وصديقة للبيئة لضمان سلامتك وسلامة أفراد أسرتك. - فحص وصيانة المكيفات: بالإضافة إلى التنظيف، نقوم بفحص المكيفات للتأكد من عدم وجود أي مشاكل تقنية وضمان عملها بكفاءة عالية. - شركة تنظيف مكيفات سبليت بالرياض تخصصنا في شركة تنظيف مكيفات سبليت بالرياض يجعلنا الخيار المثالي للعناية بمكيفات السبليت في منزلك. نحن نعلم أن مكيفات السبليت تحتاج إلى عناية خاصة لضمان أدائها الأمثل. **مميزات خدمة تنظيف مكيفات السبليت لدينا**: - تنظيف الفلاتر والأجزاء الداخلية: نقوم بتنظيف الفلاتر والأجزاء الداخلية للمكيف بدقة لضمان تدفق هواء نظيف ونقي. - إزالة الأتربة والبكتيريا: نحرص على إزالة الأتربة والبكتيريا المتراكمة داخل المكيفات لمنع انتشارها في الهواء. - تعطير المكيفات: بعد التنظيف، نقوم بتعطير المكيفات لتوفير هواء منعش وذو رائحة طيبة في منزلك. **غسيل مكيفات بالرياض** إذا كنت تبحث عن خدمات غسيل مكيفات بالرياض تضمن لك تنظيفاً عميقاً وشاملاً، فإن شركة ركين لايت هي الخيار الأمثل. نحن نقدم خدمات غسيل مكيفات تضمن إزالة الأتربة والأوساخ بشكل كامل، مما يحسن من كفاءة المكيف ويطيل عمره الافتراضي. **خطوات غسيل المكيفات لدينا**: - فحص شامل للمكيفات: قبل بدء عملية الغسيل، نقوم بفحص شامل للمكيفات لتحديد حالة الأجزاء المختلفة وضمان عدم وجود مشاكل تحتاج إلى إصلاح. - استخدام معدات متطورة: نستخدم معدات وأدوات متطورة لضمان عملية غسيل فعالة وعميقة لجميع أجزاء المكيف. - تجفيف وتعقيم المكيفات: بعد الغسيل، نقوم بتجفيف وتعقيم المكيفات لضمان عدم وجود أي رطوبة قد تسبب في الروائح الكريهة أو نمو الفطريات.

raqin_company_63e7d5d7ef7

Difference between main branches and master branches in #git and #github

A post by Aadarsh Kunwar

https://dev.to/aadarshk7/difference-between-main-branches-and-master-branches-in-git-and-github-1kb9

git, github, developer

aadarshk7

Life as a software developer

Satisfaction in Building Product coming to life Teamwork Mentor and learn from the...

https://dev.to/sydney_abuya_87/life-as-a-software-developer-5d7a

productivity, laravel, webdev, programming

**Satisfaction in Building** - Product coming to life **Teamwork** - Mentor and learn from the rest **Evolving** - Taking up new challenges - Thinking outside the box - Involves : creating new features, optimization of code, critical debugging ## What makes a good developer - **Error Handling** : What if this happens - **Handling to empty/null value**: This is having the capability of returning a valid message for the user whenever nothing is found form your query. ## Levels as a Software Developer 1. Needs improvement 2. Consistently meeting expectation 3. Exceeds expectations 4. Strongly Exceeds 5. Superb Where do you fall?

sydney_abuya_87