Defining repository interfaces

Now that we’ve gained a solid understanding of how to create and define the responsibilities of a repository, let’s explore how we can leverage repository interfaces to enhance the flexibility and testability of our code.

In Flutter, using interfaces isn’t a strict requirement, but it can significantly improve your code’s maintainability, flexibility, and testability. Repository interfaces act as blueprints for repositories, defining the contract that each repository must adhere to. While implementing the repository, following this contract ensures that the repository behaves consistently across your app.

Interfaces in Dart

If you’re coming to the Dart language from languages such as Java, you might be surprised that interfaces and classes can behave differently from what you expect. For example, in Java, if you defined an entity with a keyword interface, then in any class definition you can only implement that...