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38 lines
909 B
38 lines
909 B
import isNumber from './isNumber.js'; |
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/** |
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* Checks if `value` is `NaN`. |
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* |
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* **Note:** This method is based on |
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* [`Number.isNaN`](https://mdn.io/Number/isNaN) and is not the same as |
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* global [`isNaN`](https://mdn.io/isNaN) which returns `true` for |
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* `undefined` and other non-number values. |
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* |
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* @static |
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* @memberOf _ |
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* @since 0.1.0 |
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* @category Lang |
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* @param {*} value The value to check. |
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* @returns {boolean} Returns `true` if `value` is `NaN`, else `false`. |
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* @example |
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* |
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* _.isNaN(NaN); |
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* // => true |
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* |
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* _.isNaN(new Number(NaN)); |
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* // => true |
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* |
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* isNaN(undefined); |
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* // => true |
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* |
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* _.isNaN(undefined); |
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* // => false |
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*/ |
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function isNaN(value) { |
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// An `NaN` primitive is the only value that is not equal to itself. |
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// Perform the `toStringTag` check first to avoid errors with some |
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// ActiveX objects in IE. |
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return isNumber(value) && value != +value; |
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} |
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export default isNaN;
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