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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