code: function() {
        var done = Todos.done().length;
        var remaining = Todos.remaining().length;
  
        if (Todos.length) {
          this.main.show();
          this.footer.show();
          this.footer.html(this.statsTemplate({done: done, remaining: remaining}));
        } else {
          this.main.hide();
          this.footer.hide();
        }
  
        this.allCheckbox.checked = !remaining;
      }
docs: Re-rendering the App just means refreshing the statistics -- the rest of the app doesn't change.