state_update_compose_view_model.kt

class MainViewModel: ViewModel() {

    private var creditScore = mutableStateOf(0)
    private var age = mutableStateOf(18)

    val isEligible = derivedStateOf {
        creditScore > 400 && age > 18 && age < 70
    }
    
    fun creditScore(score: Int) {
        creditScore.value = score
    }

    fun age(age: Int) {
        this.age.value = age
    }
}