Is there a concise way to pattern match on a value...

# getting-started

[CJ Lindblad]

Is there a concise way to pattern match on a value and check if it is a member of multiple collections? I would like to write this, but it’s not valid syntax. (Adding the lists together would make sense in this example, but not in the real code).

when (someValue) {
  in list1 && in list2 -> TODO()
}

Or do I have to write it like this?

when {
  someValue in list1 && someValue in list2 -> TODO()
}

[CJ Lindblad]

For clarity, the real code has lots of cases where it checks membership in a bunch of collections.

[CJ Lindblad]

And the ”or” variant would be possibe with:

when (someValue) {
  in list1, in list2 -> TODO()
}

But I need the ”and” 😁

[ephemient]

you might be looking for https://youtrack.jetbrains.com/issue/KT-28359/Arbitrary-predicates-in-branches-of-when-with-argument or one of the related issues