Implementing the Domain Layer

In this section, we're going to create the necessary Entities, Failures, Repositories and Use Cases as part of our application's Domain Layer.

The following topics will be covered:

A. Core Dependencies

We'll import the core dependencies of the project to implement our clean architecture.

B. Creating an Entity

We'll design a class for our Note objects.

C. Creating a Failure

We'll create some Failure objects to represent the possible errors of the note feature.

D. Creating a Repository Interface

We'll make a Repository class for interfacing with the infrastructure layer to manage our notes.

E. Creating Use Cases

We'll create multiple use cases that can be called by the client application to create, fetch or delete notes.

Before you begin

• Make sure you have followed the Creating the Flutter Project guide.