1/** Used as references for various `Number` constants. */
2var MAX_SAFE_INTEGER = 9007199254740991;
3
4/**
5 * Checks if `value` is a valid array-like length.
6 *
7 * **Note:** This method is loosely based on
8 * [`ToLength`](http://ecma-international.org/ecma-262/7.0/#sec-tolength).
9 *
10 * @static
11 * @memberOf _
12 * @since 4.0.0
13 * @category Lang
14 * @param {*} value The value to check.
15 * @returns {boolean} Returns `true` if `value` is a valid length, else `false`.
16 * @example
17 *
18 * _.isLength(3);
19 * // => true
20 *
21 * _.isLength(Number.MIN_VALUE);
22 * // => false
23 *
24 * _.isLength(Infinity);
25 * // => false
26 *
27 * _.isLength('3');
28 * // => false
29 */
30function isLength(value) {
31  return typeof value == 'number' &&
32    value > -1 && value % 1 == 0 && value <= MAX_SAFE_INTEGER;
33}
34
35module.exports = isLength;
36