ViewStateExample.kt

sealed class MyViewState {
	class Error(val cause: String): MyViewState()
	object Loading: MyViewState()
	class DataLoaded(data: Data): MyViewState()
}

[...MyView...]
fun render(viewState: MyViewState) {
	when (viewState) {
		MyViewState.Error -> { // handle error state 
		}
		MyViewState.Success -> { // populate view accordling or change it 
		}
		MyViewState.Loading -> { // show a loading somehow 
		}
	}
}