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35 lines
802 B
35 lines
802 B
/** Used as references for various `Number` constants. */ |
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var MAX_SAFE_INTEGER = 9007199254740991; |
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/** |
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* Checks if `value` is a valid array-like length. |
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* |
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* **Note:** This method is loosely based on |
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* [`ToLength`](http://ecma-international.org/ecma-262/7.0/#sec-tolength). |
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* |
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* @static |
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* @memberOf _ |
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* @since 4.0.0 |
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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 a valid length, else `false`. |
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* @example |
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* |
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* _.isLength(3); |
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* // => true |
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* |
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* _.isLength(Number.MIN_VALUE); |
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* // => false |
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* |
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* _.isLength(Infinity); |
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* // => false |
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* |
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* _.isLength('3'); |
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* // => false |
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*/ |
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function isLength(value) { |
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return typeof value == 'number' && |
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value > -1 && value % 1 == 0 && value <= MAX_SAFE_INTEGER; |
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} |
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module.exports = isLength;
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