Listing 3.8: toggleClass() method.

Chapter 3/03.js

@@ -14,4 +14,8 @@ $(document).ready(function () {
     $('#switcher button').removeClass('selected');
     $(this).addClass('selected');
   });
+
+  $('#switcher h3').click(function () {
+    $('#switcher button').toggleClass('hidden');
+  });
 });