Is it possible to zip 3 lists? I am zipping 2 here...

# getting-started

[Nat Strangerweather]

Is it possible to zip 3 lists? I am zipping 2 here, but I would like to throw a list of icons into the mix. How would it work in Kotlin?

@Composable
fun ShowDropDown(
    openDropDown: MutableState<Boolean>,
    text: List<String>,
    destination: List<DirectionDestination>,
    navigator: DestinationsNavigator,
) {
    DropdownMenu(
        expanded = openDropDown.value,
        onDismissRequest = { openDropDown.value = false },
    ) {
        text.zip(destination)
            .forEach {
                DropdownMenuItem(onClick = { navigator.navigate(it.second) },
                text = { Text(it.first) })
            }

    }
}

[Landry Norris]

What do you want in the zipped list? You could do list1.zip(list2.zip(list3)) , and it would be a List<Pair<A, Pair<B, C>>>, where A, B, and C are the types of list1, list2, and list3.

[Landry Norris]

If you wanted a Triple, you could add

.map { abc ->
   Triple(abc.first, abc.second.first, abc.second.second)
}

[Nat Strangerweather]

oh great, thanks for this!

[Landry Norris]

I would write an extension for this to keep everything clean. When you nest Pairs, it gets hard to read.

[Michael de Kaste]

late to the party, but you could use the transform part of the zip function to keep it nice and readable along the way

list1.zip(list2).zip(list3) { (a, b), c -> Triple(a, b, c) }