or more explicit and less cryptic: ``` listOf(...

# stdlib

[gildor]

or more explicit and less cryptic:

listOf(2, 3, 4).flatMap { item ->
        if (item % 2 == 0) {
            List(2) { if (it == 0) item else -item }
        } else {
            listOf(item)
        }
    }

[ilya.gorbunov]

gildor: listOf(item, -item) is even less cryptic than List(2) { if (it == 0) item else -item }

[gildor]

oh yeah, of course 😅 just tried to modify my original example

[marcinmoskala]

listOf(2, 3, 4).flatMap { if (it % 2 == 0) listOf(it, -it) else listOf(it) }