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/** Used as references for various `Number` constants. */ | |
var MAX_SAFE_INTEGER = 9007199254740991; | |
/** Used to detect unsigned integer values. */ | |
var reIsUint = /^(?:0|[1-9]\d*)$/; | |
/** | |
* Checks if `value` is a valid array-like index. | |
* | |
* @private | |
* @param {*} value The value to check. | |
* @param {number} [length=MAX_SAFE_INTEGER] The upper bounds of a valid index. | |
* @returns {boolean} Returns `true` if `value` is a valid index, else `false`. | |
*/ | |
function isIndex(value, length) { | |
var type = typeof value; | |
length = length == null ? MAX_SAFE_INTEGER : length; | |
return !!length && | |
(type == 'number' || | |
(type != 'symbol' && reIsUint.test(value))) && | |
(value > -1 && value % 1 == 0 && value < length); | |
} | |
export default isIndex; | |