How can I get a list of a?
```data class Item(val ...
# androida
Ahmed Sellami
12/16/2022, 10:14 AMHow can I get a list of a?
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data class Item(val a: Int, val b: Int)
val items = listOf(Item(1,2), Item(3,4))
val aList = // [1,3]j
Jakub Syty
12/16/2022, 10:23 AM Copy code
val aList = items.map { it.a }✅ 1
👍 1
a
Ahmed Sellami
12/16/2022, 10:41 AMHow can I do the inverse? Construct items from aList and bList in a neat way?
j
Jakub Syty
12/16/2022, 10:42 AMaList zip bList will give you list of pairs, you can also provide a transform function
Jakub Syty
12/16/2022, 10:42 AM Copy code
aList.zip(bList) { (a, b) ->
Item(a, b)
}a
Ahmed Sellami
12/16/2022, 10:55 AMzip works, but couldn't provide a transform function:
ERROR:
Iterable<TypeVariable(T)>.zip(Array<out TypeVariable(R)>, (a: TypeVariable(T), b: TypeVariable(R)) → TypeVariable(V)) where T = TypeVariable(T), R = TypeVariable(R), V = TypeVariable(V) for inline fun <T, R, V> Iterable<T>.zip(other: Array<out R>, transform: (a: T, b: R) → V): List<V> defined in kotlin.collections
Iterable<TypeVariable(T)>.zip(Iterable<TypeVariable(R)>, (a: TypeVariable(T), b: TypeVariable(R)) → TypeVariable(V)) where T = TypeVariable(T), R = TypeVariable(R), V = TypeVariable(V) for inline fun <T, R, V> Iterable<T>.zip(other: Iterable<R>, transform: (a: T, b: R) → V): List<V> defined in kotlin.collections
Ahmed Sellami
12/16/2022, 10:57 AMSo, I guess I will do this:
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aList.zip(bList).map { Item(it.first, it.second) }Jakub Syty
12/16/2022, 11:23 AMjust remove the parenthisis over (a, b) and it will be fine
✅ 1
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