View Model

The Model in MVVM

What belongs in the Model layer of MVVM, how it differs from ViewModel state, and how to test it.

The ViewModel in MVVM

How the ViewModel exposes observable state and commands, manages lifecycle, and stays independently testable.

ViewModel Basics

What Android's ViewModel class does, how it survives configuration changes, and how to create and scope ViewModels correctly in a Compose app.

ViewModel Basics in SwiftUI

A hands-on look at how to actually write, own, and wire up a ViewModel class in a SwiftUI app, using @Observable and @MainActor correctly.

What is the MVVM Pattern?

MVVM (Model-View-ViewModel) is an architectural pattern where the View binds declaratively to a ViewModel’s observable state, and the ViewModel exposes data an…