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kotlinlang

How should the `Stateful by state()` part of this should be interpreted? `class MySuperCoolActivity : Activity(), Stateful by state() ` and `state()` is a global function

`Stateful` is an interface, and `MySuperCoolActivity` implements that interface by delegating all calls to whatever `state()` returns.

Yes, `Stateful`is an interface, and `state()` is a function that returns an implementation of `state()`. The example I was looking at showed that you could then call functions of `Stateful` in your `MySuperCoolActivity`. Means you can offload implementation of interfaces to other classes while still keeping the ability to directly call the functions, neat!