application-state-1.kt

class TeaPotService {
    fun turnOn() {
        //do something
    }
    fun turnOff() {
        //do something
    }
}

fun main() {
    var teaPotTurnedOn = false
    val turnOnTheTeaPot = true
    val teaPotService = TeaPotService()
    if (turnOnTheTeaPot) {
        teaPotService.turnOn()
        teaPotTurnedOn = true
    } else {
        teaPotService.turnOff()
        teaPotTurnedOn = false
    }
}