If user experience runs deeper than the user interface, we need a way to talk about an app that isn’t just visual, and that captures behavior in a more fundamental way. Programmers think in terms of complicated things like objects, callbacks, streams, functionals, and so on. They’re essential for structuring code, but for behavior a much simpler model is effective. State machines That model is the state machine. You’ve probably come across state machines, either in a class about the the...
