define(['./mapDelete', './mapGet', './mapHas', './mapSet'], function(mapDelete, mapGet, mapHas, mapSet) {

  /**
   * Creates a cache object to store key/value pairs.
   *
   * @private
   * @static
   * @name Cache
   * @memberOf _.memoize
   */
  function MapCache() {
    this.__data__ = {};
  }

  // Add functions to the `Map` cache.
  MapCache.prototype['delete'] = mapDelete;
  MapCache.prototype.get = mapGet;
  MapCache.prototype.has = mapHas;
  MapCache.prototype.set = mapSet;

  return MapCache;
});