Anybody also wondering about this topic? When does...

# announcements

[Dennis Schröder]

Anybody also wondering about this topic?
When does a when expression in kotlin need to be exhaustive and when does it not?

https://github.com/Dobiasd/articles/blob/master/when_does_a_when_expression_in_kotlin_need_to_be_exhaustive_and_when_does_it_not.md

[karelpeeters]

I think there are two separate things here:
• there is a warning for enums and not for sealed classes
• whether or not a when is a lambda is considered an expression depends on the possible (?) return type. I'm curious as to how the exact decision making for this process goes, this is a minimal example:

run {
	when(Foo.A) {
		Foo.A -> Unit
	}
}
run {
	when(Foo.A) {
		Foo.A -> 5
	}
}