localStorage fallback

js/local_score_manager.js

@@ -1,24 +1,31 @@
+window.fakeStorage = {
+  _data       : {},
+  setItem     : function (id, val) {
+    console.log('set');
+    return this._data[id] = String(val);
+  },
+  getItem     : function (id) {
+    return this._data.hasOwnProperty(id) ? this._data[id] : undefined;
+  },
+  removeItem  : function (id) { return delete this._data[id]; },
+  clear       : function () { return this._data = {}; }
+};
+
 function LocalScoreManager() {
+  var localSupported = !!window.localStorage;
   this.key = 'bestScore';
+  this.storage =  localSupported ? window.localStorage : window.fakeStorage;
 }
 
 LocalScoreManager.prototype.get = function () {
-  if (!this.isSupported()) {
-    return 0;
+  var score = this.storage.getItem(this.key);
+  if (typeof score === "undefined" || score === null) {
+    score = 0;
   }
-
-  return localStorage.getItem(this.key);
+  return score;
 };
 
 LocalScoreManager.prototype.set = function (score) {
-  if (!this.isSupported()) {
-    return false;
-  }
-
-  localStorage.setItem(this.key, score);
-};
-
-LocalScoreManager.prototype.isSupported = function () {
-  return !!window.localStorage;
+  this.storage.setItem(this.key, score);
 };