/** Used as references for various `Number` constants. */ var MAX_SAFE_INTEGER = 9007199254740991;

/** Used to detect unsigned integer values. */ var reIsUint = /^(?:0|d*)$/;

/**

* 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`.
*/

function isIndex(value, length) {

var type = typeof value;
length = length == null ? MAX_SAFE_INTEGER : length;

return !!length &&
  (type == 'number' ||
    (type != 'symbol' && reIsUint.test(value))) &&
      (value > -1 && value % 1 == 0 && value < length);

}

module.exports = isIndex;