| /** |
| * Used as the [maximum length](http://ecma-international.org/ecma-262/6.0/#sec-number.max_safe_integer) |
| * of an array-like value. |
| */ |
| var MAX_SAFE_INTEGER = 9007199254740991; |
| |
| /** |
| * Checks if `value` is a valid array-like length. |
| * |
| * **Note:** This function is based on [`ToLength`](http://ecma-international.org/ecma-262/6.0/#sec-tolength). |
| * |
| * @private |
| * @param {*} value The value to check. |
| * @returns {boolean} Returns `true` if `value` is a valid length, else `false`. |
| */ |
| function isLength(value) { |
| return typeof value == 'number' && value > -1 && value % 1 == 0 && value <= MAX_SAFE_INTEGER; |
| } |
| |
| module.exports = isLength; |