Composable Kotlin

compose.kt

// source - https://stefma.medium.com/jetpack-compose-remember-mutablestateof-derivedstateof-and-remembersaveable-explained-270dbaa61b8

@Composable
private fun CounterWithDerivedState() {
    // salvar stado em caso a activity seja recaregada - rememberSaveable
    val counterState = remember { mutableStateOf(0) }

    val showHurrayState = remember {
        derivedStateOf { counterState.value > 10 }
    }

    Button(
        onClick = { counterState.value = counterState.value + 1 }
    ) {
        Text(counterState.value.toString())
    }

    if (showHurrayState.value) Text("Hurray!")
}