Added polyfill for Array#find

Author: Minkov

14. Exam - Fortune Cookies/solution-doncho/public/index.html

@@ -82,6 +82,7 @@ <h1 class="page-header col-md-6">
   <script src="js/controllers/my-cookie.js"></script>
 
   <!-- App: Loaders -->
+  <script src="js/app/polyfills/array.js"></script>
   <script src="js/app/data.js"></script>
   <script src="js/app/templates.js"></script>
   <script src="js/app/json-requester.js"></script>

14. Exam - Fortune Cookies/solution-doncho/public/js/app/polyfills/array.js

@@ -0,0 +1,22 @@
+if (!Array.prototype.find) {
+  Array.prototype.find = function(predicate) {
+    if (this === null) {
+      throw new TypeError('Array.prototype.find called on null or undefined');
+    }
+    if (typeof predicate !== 'function') {
+      throw new TypeError('predicate must be a function');
+    }
+    var list = Object(this);
+    var length = list.length >>> 0;
+    var thisArg = arguments[1];
+    var value;
+
+    for (var i = 0; i < length; i++) {
+      value = list[i];
+      if (predicate.call(thisArg, value, i, list)) {
+        return value;
+      }
+    }
+    return undefined;
+  };
+}