Is there an example of how to write custom hooks in Compose? In React, you can extract logic into a ...

# compose

[Orhan Tozan]

Is there an example of how to write custom hooks in Compose? In React, you can extract logic into a hook. No UI, just pure logic. Curious how people would do this in Compose

[nschulzke]

What kind of logic? I/O or other side effects, or just control flow?

[Orhan Tozan]

something like

const [isUploading, uploadMessage] = useUploadMessage()

[Orhan Tozan]

Something that accepts events and emits data

[Adam Powell]

Flow<T>.collectAsState, produceState, and LaunchedEffect will all likely be interesting to you

[krzysztof]

Well, not a hooks per se, but you could achieve something similar by using Effects and State. For example:

private class MyLogic(val scope: CoroutineScope, val otherNoneCompose: String){/* implement some business logic */}

@Composable
fun MyHook(dependencies: String) {
  val scope = rememberCoroutineScope()
  val myLogic = remember(scope, dependencies) { MyLogicHere(scope, dependencies) }

  DisposableEffect(dependencies) {
    onDispose {}
  }

  return myLogic
}

[Csaba Szugyiczki]

or you could just use LaunchedEffect instead of DisposableEffect and run myLogic as a suspend lambda inside