Step 4 -> 5

4.diff

 var Statuses = function() {
 };
 Statuses.prototype.add = function(options) {
     $.ajax({
         url: '/status',
         type: 'POST',
         dataType: 'json',
         data: { text: options.text },
         success: options.success
     });
 };

+var NewStatusView = function(options) {
+    var statuses = options.statuses;
+
+    $('#new-status form').submit(function(e) {
+        e.preventDefault();
+
+        statuses.add({
+            text: $('#new-status textarea').val(),
+            success: function(data) {
+                $('#statuses ul').append('<li>' + data.text + '</li>');
+                $('#new-status textarea').val('');
+            }
+        });
+    });
+};
+
 $(document).ready(function() {
     var statuses = new Statuses();

-    $('#new-status form').submit(function(e) {
-        e.preventDefault();
-
-        statuses.add({
-            text: $('#new-status textarea').val(),
-            success: function(data) {
-                $('#statuses ul').append('<li>' + data.text + '</li>');
-                $('#new-status textarea').val('');
-            }
-        });
-    });
+    new NewStatusView({ statuses: statuses });
 });