Merge pull request #13297 from gaye/bug-918303

Bug 918303 - Quick advance through emails

apps/email/js/array.js

@@ -0,0 +1,23 @@
+/*global define */
+define(function(require) {
+  var array = {
+    /**
+     * @param {Array} array some array.
+     * @param {Function} callback function to test for each element.
+     * @param {Object} thisObject object to use as this for callback.
+     */
+    indexOfGeneric: function(array, callback, thisObject) {
+      var result = -1;
+      array.some(function(value, index) {
+        if (callback.call(thisObject, value)) {
+          result = index;
+          return true;
+        }
+      });
+
+      return result;
+    }
+  };
+
+  return array;
+});