There was a time before async/await when Combine replaced all those techniques we've used for decades for passing information around in an iOS or macOS App asynchronously: Target-Action, callbacks, closures, delegates, notifications. As much as I love Combine, it you aren't already using it in your project, you should embrace the newer language level features in async/await.

This hand-on, fast-moving kickstart introduces you to the future of declarative and reactive programming on Apple platforms. We focus on core concepts and building discrete, easy-to-understand, pieces of a pipeline that allows your app to react to changes in the state.

Updated for Xcode 12 and Swift 5.3 and tested on Apple Silicon.