code: function add(props) {
             Object.keys(props).forEach(function (key) {
               if (isReserved(key)) {
                 return;
               }
  
               (function (prop) {
                 Object.defineProperty(api, prop, {
                   configurable: true,
                   enumerable: true,
  
                   /**
                    * @ignore
                    */
                   get: function get() {
                     return data[prop];
                   },
  
                   /**
                    * @ignore
                    */
                   set: function set(value) {
                     data[prop] = value;
  
                     if (me.device.localStorage === true) {
                       localStorage.setItem("me.save." + prop, JSON.stringify(value));
                     }
                   }
                 });
               })(key); // Set default value for key
  
  
               if (!(key in data)) {
                 api[key] = props[key];
               }
             }); // Save keys
  
             if (me.device.localStorage === true) {
               localStorage.setItem("me.save", JSON.stringify(Object.keys(data)));
             }
           }
docs: Add new keys to localStorage and set them to the given default values if they do not exist
  @name add
  @memberOf me.save
  @function
  @param {Object} props key and corresponding values
  @example
  // Initialize "score" and "lives" with default values
  me.save.add({ score : 0, lives : 3 });