Hi, How I can collect value when my flow emit the same value? Now when I emit Option.Default, printl...

# coroutines

[Ink]

Hi, How I can collect value when my flow emit the same value? Now when I emit Option.Default, println doesn't invoke
var option: Option by mutableStateOf(Option.Default)

fun optionsFlow(): Flow<Option> = snapshotFlow { option }

option = Option.Default

launch{
state.optionsFlow().collectLatest{
println(it)
}
}

[CLOVIS]

snapshotFlow doesn't emit when the same value is emitted multiple times: https://developer.android.com/jetpack/compose/side-effects#snapshotFlow

[Ink]

ahh, ok should I use flow?

[CLOVIS]

It depends on what you want to do. Why are you mutating the variable to the same value as previously?

[Zach Klippenstein (he/him) [MOD]]

There are two things going on here:
1. mutableStateOf will ignore value updates with equivalent values by default.
2. snapshotFlow won’t emit duplicate values either, as previously mentioned
1 can be changed by passing a mutation policy to mutableStateOf, but 2 is hard-coded.

[Zach Klippenstein (he/him) [MOD]]

This is a high-level property of “state” with a lowercase s. Two states that have the value are the same state. “Changing” a state from one value to the same value isn’t a state change event because the state hasn’t changed.

[Zach Klippenstein (he/him) [MOD]]

If you want more direct control of the flow you could consider MutableSharedFlow, but then be careful not to emit directly from the composition (use a SideEffect).