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					38 lines
				
				949 B
			
		
		
			
		
	
	
					38 lines
				
				949 B
			| 
											3 years ago
										 | var isInteger = require('./isInteger'); | ||
|  | 
 | ||
|  | /** Used as references for various `Number` constants. */ | ||
|  | var MAX_SAFE_INTEGER = 9007199254740991; | ||
|  | 
 | ||
|  | /** | ||
|  |  * Checks if `value` is a safe integer. An integer is safe if it's an IEEE-754 | ||
|  |  * double precision number which isn't the result of a rounded unsafe integer. | ||
|  |  * | ||
|  |  * **Note:** This method is based on | ||
|  |  * [`Number.isSafeInteger`](https://mdn.io/Number/isSafeInteger).
 | ||
|  |  * | ||
|  |  * @static | ||
|  |  * @memberOf _ | ||
|  |  * @since 4.0.0 | ||
|  |  * @category Lang | ||
|  |  * @param {*} value The value to check. | ||
|  |  * @returns {boolean} Returns `true` if `value` is a safe integer, else `false`. | ||
|  |  * @example | ||
|  |  * | ||
|  |  * _.isSafeInteger(3); | ||
|  |  * // => true
 | ||
|  |  * | ||
|  |  * _.isSafeInteger(Number.MIN_VALUE); | ||
|  |  * // => false
 | ||
|  |  * | ||
|  |  * _.isSafeInteger(Infinity); | ||
|  |  * // => false
 | ||
|  |  * | ||
|  |  * _.isSafeInteger('3'); | ||
|  |  * // => false
 | ||
|  |  */ | ||
|  | function isSafeInteger(value) { | ||
|  |   return isInteger(value) && value >= -MAX_SAFE_INTEGER && value <= MAX_SAFE_INTEGER; | ||
|  | } | ||
|  | 
 | ||
|  | module.exports = isSafeInteger; |