i don't suppose there's a way to say

when (foo) { != 0 -> stuff(); else -> blah() }

, while still using the var specifier, aka the

(foo)

sreich: I suppose your real usecase is much more complicated, but just swap the branches

Yeah there's a few more branches

another hacky approach would be

!in 0..0

you just need to use

var foo

inside when?

Eh inside where?

when (foo) {
   5 -> onlyWhenFive()
   foo != 0 -> stuff()
   else -> blah()
}

would still be possible EDIT: okay, that's not valid, wasn't aware that you can't mix when expressions types... I thought it would be as mighty as in scala but there seems to be a quite big gap

And you can't just do !0 in the branch can you?

nope, that's not possible either. there are no boolean expressions on the argument passed to when, just the kotlin keywords

in

and

is

just so we're clear, the fully verbosity is

when {
  foo == 5 -> onlyWhenFive()
  foo != 0 -> stuff()
  else -> blah()
}

so the thing we're trying to eliminate here is a couple of extra

foo

_expr_'s. I could've sworn there were some issues for this but I cant find them now