I'd like to know the simplest way to make a StateFlow directly depend on another. For example, let's say in my viewmodel I have:

private val _stateFlow1 = MutableStateFlow(0)

Is there a way to define

_stateFlow2

so that

_stateFlow2.value = _stateFlow1.value * _stateFlow1.value

?

val _stateFlow1 = MutableStateFlow(0)
val _stateFlow2 = _stateFlow1.map { it * it }.stateIn(viewModelScope)

That is if you need _stateFlow2 to be a StateFlow otherwise you can drop

stateIn()

Don't you need a coroutine do that?

Not externally, that is why stateIn() requires a scope so it can launch an internal coroutine context.

Well, I had tried that but it's giving me

Suspend function 'stateIn' should be called only from a coroutine or another suspend function

Oops wrong

stateIn()

there is a non-suspending one

val _stateFlow1 = MutableStateFlow(0)
val _stateFlow2 = _stateFlow1.map { it * it }.stateIn(viewModelScope, SharingStarted.Eagerly, _stateFlow1.value)

Awesome, would never have figured out that one! 🙇‍♂️