In this talk, learn how to use the Model-View-ViewModel pattern to write testable user interfaces on platforms beyond XAML-based ones. With ReactiveUI, an MVVM Framework that is designed for cross-platform applications, you can see how to write ViewModels that run on iOS, Android, and Windows, while still creating native experiences on each platform. Specifically, we’ll dive into Cocoa / AppKit, and see how to wire up ViewModels to Cocoa Views and ViewControllers, using the same syntax as in a WPF application, providing an amazing potential for code reuse in cross-platform environments.