I want to trigger a callback once a derivedStateOf changes. My code currently looks like this:

var previouslySelectedIndex by rememberSaveable { mutableStateOf<Int?>(null) }

val nowSelectedIndex by remember {
    derivedStateOf {
        // some logic here
    }
}

nowSelectedIndex?.let { nowSelected ->
    if(previouslySelectedIndex == null || previouslySelectedIndex != nowSelected) {
        previouslySelectedIndex = nowSelected
        onSelectedItemChanged(nowSelected)
    }
}

That feels very verbose to me, especially considering that we know the derivedStateOf only triggers when it’s changed. Is there really nothing like the following?

nowSelectedIndex.onChange { onSelectedItemChanged(nowSelected) }