In this chapter, we acknowledged the importance of defining a domain model before starting the development of an app. We used a graphical tool (model concepts) to design a model for categories and links, which can be exported in the JSON format. Also, we saw how JSON can be used in Dart. A simple domain model framework, Dartlero, was explored and we implemented it in two models: a project model and a category links model. By doing this, we exercised the knowledge of classes, interfaces, generics, Lists, Maps, and unit testing that we acquired in Chapter 2, Getting to Work with Dart.

The next few chapters are more practical in nature. We will learn how to work with the Document Object Model (DOM) in the HTML pages, how to build forms, how to draw, and how to use audio and video in the web pages.