Sealed with Enum (<https://antonioleiva.com/sealed...

# announcements

[Eugen Martynov]

Sealed with Enum (https://antonioleiva.com/sealed-classes-kotlin/)

[df]

Maybe the example is just to simple to show the advantage of sealed classes but having fun execute(x: Int): Int defined as a method of Operation (could be an interface) the whole when block would turn into op.execute(x) which is imo the better approach.