| 1 | /** Used as references for various `Number` constants. */
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| 2 | var MAX_SAFE_INTEGER = 9007199254740991;
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| 3 |
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| 4 | /**
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| 5 | * Checks if `value` is a valid array-like length.
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| 6 | *
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| 7 | * **Note:** This function is loosely based on
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| 8 | * [`ToLength`](http://ecma-international.org/ecma-262/6.0/#sec-tolength).
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| 9 | *
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| 10 | * @static
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| 11 | * @memberOf _
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| 12 | * @since 4.0.0
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| 13 | * @category Lang
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| 14 | * @param {*} value The value to check.
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| 15 | * @returns {boolean} Returns `true` if `value` is a valid length,
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| 16 | * else `false`.
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| 17 | * @example
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| 18 | *
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| 19 | * _.isLength(3);
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| 20 | * // => true
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| 21 | *
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| 22 | * _.isLength(Number.MIN_VALUE);
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| 23 | * // => false
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| 24 | *
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| 25 | * _.isLength(Infinity);
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| 26 | * // => false
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| 27 | *
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| 28 | * _.isLength('3');
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| 29 | * // => false
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| 30 | */
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| 31 | function isLength(value) {
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| 32 | return typeof value == 'number' &&
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| 33 | value > -1 && value % 1 == 0 && value <= MAX_SAFE_INTEGER;
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| 34 | }
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| 35 |
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| 36 | export default isLength;
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