StateComposable.kt

@Composable
fun MyApp() {
    MaterialTheme { Counter() }
}

@Composable
fun Counter() {
    val amount = +state { 0 }

    Column {
        Text(text = "Counter demo")
        Button(text = "Add", onClick = { amount.value++ })
        Button(text = "Subtract", onClick = { amount.value-- })
        Text(text = "Clicks: ${amount.value}")
    }
}