time-to-botec

Benchmark sampling in different programming languages
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isSafeInteger.js (949B)

      1 var isInteger = require('./isInteger');
      2 
      3 /** Used as references for various `Number` constants. */
      4 var MAX_SAFE_INTEGER = 9007199254740991;
      5 
      6 /**
      7  * Checks if `value` is a safe integer. An integer is safe if it's an IEEE-754
      8  * double precision number which isn't the result of a rounded unsafe integer.
      9  *
     10  * **Note:** This method is based on
     11  * [`Number.isSafeInteger`](https://mdn.io/Number/isSafeInteger).
     12  *
     13  * @static
     14  * @memberOf _
     15  * @since 4.0.0
     16  * @category Lang
     17  * @param {*} value The value to check.
     18  * @returns {boolean} Returns `true` if `value` is a safe integer, else `false`.
     19  * @example
     20  *
     21  * _.isSafeInteger(3);
     22  * // => true
     23  *
     24  * _.isSafeInteger(Number.MIN_VALUE);
     25  * // => false
     26  *
     27  * _.isSafeInteger(Infinity);
     28  * // => false
     29  *
     30  * _.isSafeInteger('3');
     31  * // => false
     32  */
     33 function isSafeInteger(value) {
     34   return isInteger(value) && value >= -MAX_SAFE_INTEGER && value <= MAX_SAFE_INTEGER;
     35 }
     36 
     37 module.exports = isSafeInteger;