define([], function() {

  /**
   * Removes `key` and its value from the cache.
   *
   * @private
   * @name delete
   * @memberOf _.memoize.Cache
   * @param {string} key The key of the value to remove.
   * @returns {boolean} Returns `true` if the entry was removed successfully, else `false`.
   */
  function mapDelete(key) {
    return this.has(key) && delete this.__data__[key];
  }

  return mapDelete;
});