Add the indexOf method to the array prototype for older browsers.

Author: justafish

angular/app/js/app.js

@@ -1,6 +1,40 @@
 'use strict';
 
-// Declare app level module which depends on filters, and services
-angular.module('myApp', ['myApp.filters', 'myApp.services', 'myApp.directives', 'myApp.controllers']).
-  config(['$routeProvider', function($routeProvider) {
-  }]);
+angular.module('myApp', ['myApp.filters', 'myApp.services', 'myApp.directives', 'myApp.controllers'])
+
+  .run(function() {
+    if (!Array.prototype.indexOf) {
+      Array.prototype.indexOf = function (searchElement /*, fromIndex */ ) {
+        'use strict';
+        if (this == null) {
+          throw new TypeError();
+        }
+        var n, k, t = Object(this),
+          len = t.length >>> 0;
+
+        if (len === 0) {
+          return -1;
+        }
+        n = 0;
+        if (arguments.length > 1) {
+          n = Number(arguments[1]);
+          if (n != n) { // shortcut for verifying if it's NaN
+            n = 0;
+          } else if (n != 0 && n != Infinity && n != -Infinity) {
+            n = (n > 0 || -1) * Math.floor(Math.abs(n));
+          }
+        }
+        if (n >= len) {
+          return -1;
+        }
+        for (k = n >= 0 ? n : Math.max(len - Math.abs(n), 0); k < len; k++) {
+          if (k in t && t[k] === searchElement) {
+            return k;
+          }
+        }
+        return -1;
+      };
+    }
+  })
+
+;