| 1 | import isNumber from './isNumber.js';
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| 2 |
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| 3 | /**
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| 4 | * Checks if `value` is `NaN`.
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| 5 | *
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| 6 | * **Note:** This method is based on
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| 7 | * [`Number.isNaN`](https://mdn.io/Number/isNaN) and is not the same as
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| 8 | * global [`isNaN`](https://mdn.io/isNaN) which returns `true` for
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| 9 | * `undefined` and other non-number values.
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| 10 | *
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| 11 | * @static
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| 12 | * @memberOf _
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| 13 | * @since 0.1.0
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| 14 | * @category Lang
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| 15 | * @param {*} value The value to check.
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| 16 | * @returns {boolean} Returns `true` if `value` is `NaN`, else `false`.
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| 17 | * @example
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| 18 | *
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| 19 | * _.isNaN(NaN);
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| 20 | * // => true
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| 21 | *
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| 22 | * _.isNaN(new Number(NaN));
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| 23 | * // => true
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| 24 | *
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| 25 | * isNaN(undefined);
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| 26 | * // => true
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| 27 | *
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| 28 | * _.isNaN(undefined);
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| 29 | * // => false
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| 30 | */
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| 31 | function isNaN(value) {
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| 32 | // An `NaN` primitive is the only value that is not equal to itself.
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| 33 | // Perform the `toStringTag` check first to avoid errors with some
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| 34 | // ActiveX objects in IE.
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| 35 | return isNumber(value) && value != +value;
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| 36 | }
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| 37 |
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| 38 | export default isNaN;
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