Does anyone know if I can apply `when` on a `pair` type? Finding it a bit difficult to make it work....

# announcements

[Wahib]

Does anyone know if I can apply when on a pair type? Finding it a bit difficult to make it work.

Something like:

val pair: Pair<StatusAType, StatusBType> = ...
when(pair) {
            is (StatusA, StatusB) -> {

            }

        }

It is showing an error Type Expected in IDE

[snowe]

are you trying to check the type? or the value?

[jon.peterson]

are you trying to short-hand pair.first is StatusA && pair.second is StatusB?

[Wahib]

@jon.peterson This is not working ☝️

[Wahib]

@snowe I am trying to check values.

[Andreas Sinz]

@Wahib https://kotlinlang.org/docs/reference/multi-declarations.html Kotlin doesn't support destructuring inside when (yet?)

[Wahib]

yeah seems like it. Any kotlin workarounds I can use? Maybe like putting values to map and reading from there? It is an async operation which receives a pair after a zip operator

[Wahib]

Is it just me or the guy gave an impression that checking for Pair(x, y) is possible with when?

when(obj) {
    Pair("a", 10) -> ...
    Pair("c", 13) -> ...
    else -> ...
}

https://discuss.kotlinlang.org/t/destructuring-in-when/2391

[louiscad]

You can also use the to infix extension function in when branches