We will now show how MVC functions in a Dart version of the famous TodoMVC application (http://todomvc.com/), which is used as a standard to compare different web frameworks. This application is developed in spirals in the dartling_todo_mvc project and it is built by using the Dartling framework for the model. Download the code from https://github.com/dzenanr/dartling_todo_mvc_spirals. In the following screenshot, you see a glimpse of the end result (Spiral 6):

The TodoMVC app

The todo items can be added, edited, marked as completed, and deleted; overviews of all tasks, or only the completed or remaining ones can be shown, and the user has undo/redo possibilities after making a mistake. Moreover, it is really useful because the data is stored in local storage (using the JSON format).