Is there a function in the standard lib that could...

# announcements

[nickk]

Is there a function in the standard lib that could help in taking a list of doubles and consume 2 elements each time? I want to convert a flat list of lat-lon doubles to LatLng instances.

[kingsley]

Not at the moment. However, zipWithNext that does exactly that was just introduced in 1.2M2

[kingsley]

See https://blog.jetbrains.com/kotlin/2017/08/kotlin-1-2-m2-is-out/

[hho]

Workaround until then:

val lats = latLongs.filterIndexed { index, _ -> index % 2 == 0 }
val longs = latLongs.filterIndexed { index, _ -> index % 2 != 0 }
val coords = lats.zip(longs)

[arekolek]

Or you could do:
(x.indices step 2).map { LatLng(x[it], x[it + 1]) }

[arekolek]

BTW, zipWithNext returns a list of all adjacent pairs

[arekolek]

(1..5).zipWithNext { a, b -> println("$a, $b") } prints:

1, 2
2, 3
3, 4
4, 5

[arekolek]

x.chunked(2) { LatLng(it[0], it[1]) } would do it though