Projekt

Obecné

Profil

Stáhnout (911 Bajtů) Statistiky
| Větev: | Revize:
1
var isNumber = require('./isNumber');
2

    
3
/**
4
 * Checks if `value` is `NaN`.
5
 *
6
 * **Note:** This method is based on
7
 * [`Number.isNaN`](https://mdn.io/Number/isNaN) and is not the same as
8
 * global [`isNaN`](https://mdn.io/isNaN) which returns `true` for
9
 * `undefined` and other non-number values.
10
 *
11
 * @static
12
 * @memberOf _
13
 * @since 0.1.0
14
 * @category Lang
15
 * @param {*} value The value to check.
16
 * @returns {boolean} Returns `true` if `value` is `NaN`, else `false`.
17
 * @example
18
 *
19
 * _.isNaN(NaN);
20
 * // => true
21
 *
22
 * _.isNaN(new Number(NaN));
23
 * // => true
24
 *
25
 * isNaN(undefined);
26
 * // => true
27
 *
28
 * _.isNaN(undefined);
29
 * // => false
30
 */
31
function isNaN(value) {
32
  // An `NaN` primitive is the only value that is not equal to itself.
33
  // Perform the `toStringTag` check first to avoid errors with some
34
  // ActiveX objects in IE.
35
  return isNumber(value) && value != +value;
36
}
37

    
38
module.exports = isNaN;
(437-437/634)