sealed_classes_open.kt

open class ScreenState2 {
    object LoadingState : ScreenState2()
    class ErrorState(val error: Throwable) : ScreenState2()
    class SuccessState(val data: String) : ScreenState2()
}

fun main(args: Array<String>) {

    val response2: ScreenState2 = ScreenState2.SuccessState("yay")

    when (response2) {
        is ScreenState2.SuccessState -> doStuff(response2.data)
        is ScreenState2.LoadingState -> { }
        is ScreenState2.ErrorState -> { }
        else -> { }
    }
}

fun doStuff(data: String) {
    //NO-OP
}