Or, otherwise known as "The Composable Architecture", or "Swift Composable Architecture". I initially was drawn to it based on my experiences with the reactive architecture of Elm, but after integrating it and using it professionally for about a year at [Sense](https://sense.com/), grew disillusioned with the implementation. My main problem stemmed from the layer of abstraction atop SwiftUI that caused performance issues and undecipherable errors. If you're curious, [here's the repository for it](https://github.com/pointfreeco/swift-composable-architecture).