Function isIndex

src/shared/functions/toArray.js:542–549

* Checks if `value` is a valid array-like index. * * @private * @param {*} value The value to check. * @param {number} [length=MAX_SAFE_INTEGER] The upper bounds of a valid index. * @returns {boolean} Returns `true` if `value` is a valid index, else `false`.

(value, length)

 * @returns {boolean} Returns `true` if `value` is a valid index, else `false`.
 */
function isIndex(value, length) {
  length = length == null ? MAX_SAFE_INTEGER : length;
  return (
    !!length &&
    (typeof value === "number" || reIsUint.test(value)) &&
    (value > -1 && value % 1 === 0 && value < length)
  );
}

/**
 * Checks if `func` has its source masked.