You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
39 lines
911 B
39 lines
911 B
4 weeks ago
|
var isNumber = require('./isNumber');
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Checks if `value` is `NaN`.
|
||
|
|
*
|
||
|
|
* **Note:** This method is based on
|
||
|
|
* [`Number.isNaN`](https://mdn.io/Number/isNaN) and is not the same as
|
||
|
|
* global [`isNaN`](https://mdn.io/isNaN) which returns `true` for
|
||
|
|
* `undefined` and other non-number values.
|
||
|
|
*
|
||
|
|
* @static
|
||
|
|
* @memberOf _
|
||
|
|
* @since 0.1.0
|
||
|
|
* @category Lang
|
||
|
|
* @param {*} value The value to check.
|
||
|
|
* @returns {boolean} Returns `true` if `value` is `NaN`, else `false`.
|
||
|
|
* @example
|
||
|
|
*
|
||
|
|
* _.isNaN(NaN);
|
||
|
|
* // => true
|
||
|
|
*
|
||
|
|
* _.isNaN(new Number(NaN));
|
||
|
|
* // => true
|
||
|
|
*
|
||
|
|
* isNaN(undefined);
|
||
|
|
* // => true
|
||
|
|
*
|
||
|
|
* _.isNaN(undefined);
|
||
|
|
* // => false
|
||
|
|
*/
|
||
|
|
function isNaN(value) {
|
||
|
|
// An `NaN` primitive is the only value that is not equal to itself.
|
||
|
|
// Perform the `toStringTag` check first to avoid errors with some
|
||
|
|
// ActiveX objects in IE.
|
||
|
|
return isNumber(value) && value != +value;
|
||
|
|
}
|
||
|
|
|
||
|
|
module.exports = isNaN;
|