arrow-core-data / arrow.core / kotlin.collections.Iterable / unzip

unzip

fun <A, B> Iterable<Pair<A, B>>.unzip(): Pair<List<A>, List<B>>

unzips the structure holding the resulting elements in an Pair

import arrow.core.*

fun main(args: Array<String>) {
  //sampleStart
  val result =
     listOf("A" to 1, "B" to 2).k().unzip()
  //sampleEnd
  println(result)
}

inline fun <A, B, C> Iterable<C>.unzip(fc: (C) -> Pair<A, B>): Pair<List<A>, List<B>>

after applying the given function unzip the resulting structure into its elements.

import arrow.core.*

fun main(args: Array<String>) {
  //sampleStart
  val result =
   listOf("A:1", "B:2", "C:3").k().unzip { e ->
     e.split(":").let {
       it.first() to it.last()
     }
   }
  //sampleEnd
  println(result)
}