/** * Used as the [maximum length](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-number.max_safe_integer) * of an array-like value. */ var MAX_SAFE_INTEGER = Math.pow(2, 53) - 1; /** * Checks if `value` is a valid array-like length. * * **Note:** This function is based on [`ToLength`](https://people.mozilla.org/~jorendorff/es6-draft.html#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;