code: function hashHas(key) {
      var data = this.__data__;
      return nativeCreate ? data[key] !== undefined : hasOwnProperty.call(data, key);
    }
docs: Checks if a hash value for `key` exists.
  
  @private
  @name has
  @memberOf Hash
  @param {string} key The key of the entry to check.
  @returns {boolean} Returns `true` if an entry for `key` exists, else `false`.