Hi guys! Do you see a way to reduce this? ```val m...

# random

[LeoColman]

Hi guys!
Do you see a way to reduce this?

val myList = listOf("A", "AA", "B", "BB")
val aIndices = myList.mapIndexedNotNull { index, str -> if("A" in str) index else null } // 0 and 1

[LeoColman]

Map indexed not null seems to be a weird solution to this case

[LeoColman]

Where I need all the indices that match a specific condition

[LeoColman]

It's like applying a.filter { predicate }.indices, but in a way that would work instead of losing the indices

[Youssef Shoaib [MOD]]

While sacrificing performance:

myList.withIndex().filter { "A" in it.value }.map(IndexedValue<*>::index)

[Youssef Shoaib [MOD]]

or if you want to keep performance sane enough:

myList.mapIndexedNotNull { index, str -> index.takeIf { "A" in str } }

[LeoColman]

Both are prettier options!

[LeoColman]

That takeIf was a nice catch, I forgot about it!