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