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kotlinlang

just want to confirm this kind of code is ok `when (foo?.bar) {..}` - I can't see why it wouldn't be but just want to make sure about the null

It’s okay, just remember that `null` is one of the possible values of `foo?.bar` (and so must be handled in the `when` clause if not using `else`).

but if i just want to ignore the null, I can't just leave it out of `-&gt;`? the IDE doesn't complain

One of the trickiest thing about Kotlin `when` is that it can be used either as an expression or a statement

If it’s used as a statement, the compiler won’t perform exhaustive checks (i.e. it won’t complain about missing arms)