Flutter MVVM clean architecture

An overview of the Observer design pattern and its implementation in Dart and Flutter. In the last article, I have analysed a behavioural design pattern that reduces dependencies between a set of interacting objects by decoupling the interaction logic from the objects and moving it to a dedicated controller — Mediator .

KEY DIFFERENCE In MVC, controller is the entry point to the Application, while in MVVM, the view is the entry point to the Application . MVC Model component can be tested separately from the user, while MVVM is easy for separate unit testing, and code is event-driven.

Architectural layers. Flutter is designed as an extensible, layered system . It exists as a series of independent libraries that each depend on the underlying layer. No layer has privileged access to the layer below, and every part of the framework level is designed to be optional and replaceable.

Model — View — ViewModel (MVVM) is the industry-recognized software architecture pattern that overcomes all drawbacks of MVP and MVC design patterns . MVVM suggests separating the data presentation logic(Views or UI) from the core business logic part of the application.

In this piece, we’ll use the MVVM design pattern to write a complete Flutter application . Flutter is a cross-platform framework that allows you to write iOS and Android apps using a single codebase.