/* This Source Code Form is subject to the terms of the Mozilla Public
                         * License, v. 2.0. If a copy of the MPL was not distributed with this
                         * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
                        
                        /**
                         * Helper functions for working with options
                         *
                         * @class Options
                         * @static
                         */
                        
                        
                        define([], function () {
                          'use strict';
                        
                          /**
                           * Check an object for a list of required options
                           *
                           * @method checkRequired
                           * @param {Array of Strings} requiredOptions
                           * @param {Object} options
                           * @throws {Error}
                           * if a required option is missing
                           */
                          function checkRequired(requiredOptions, options) {
                            for (var i = 0, requiredOption; requiredOption = requiredOptions[i]; ++i) {
                              if (! (requiredOption in options)) {
                                throw new Error(requiredOption + ' is required');
                              }
                            }
                          }
                        
                          return {
                            checkRequired: checkRequired
                          };
                        
                        });