unzip

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

inline fun <A, B, E> NonEmptyList<E>.unzip(f: (E) -> Pair<A, B>): Pair<NonEmptyList<A>, NonEmptyList<B>>

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

unzips the structure holding the resulting elements in an Pair

import arrow.core.unzip

fun main() {
  //sampleStart
  val result = sequenceOf("A" to 1, "B" to 2).unzip()
  //sampleEnd
  println("(${result.first}, ${result.second})")
}

fun <A, B, C> Sequence<C>.unzip(fc: (C) -> Pair<A, B>): Pair<Sequence<A>, Sequence<B>>

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

import arrow.core.unzip

fun main() {
  //sampleStart
  val result =
   sequenceOf("A:1", "B:2", "C:3").unzip { e ->
     e.split(":").let {
       it.first() to it.last()
     }
   }
  //sampleEnd
  println("(${result.first}, ${result.second})")
}

fun <K, A, B> Map<K, Pair<A, B>>.unzip(): Pair<Map<K, A>, Map<K, B>>

Unzips the structure holding the resulting elements in an Pair

import arrow.core.*
import io.kotest.matchers.shouldBe

fun test() {
  mapOf(
    "first" to ("A" to 1),
    "second" to ("B" to 2)
  ).unzip() shouldBe Pair(mapOf("first" to "A", "second" to "B"), mapOf("first" to 1, "second" to 2))
}

inline fun <K, A, B, C> Map<K, C>.unzip(fc: (Map.Entry<K, C>) -> Pair<A, B>): Pair<Map<K, A>, Map<K, B>>

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

import arrow.core.*
import io.kotest.matchers.shouldBe

fun test() {
  mapOf("first" to "A:1", "second" to "B:2", "third" to "C:3").unzip { (_, e) ->
    e.split(":").let {
      it.first() to it.last()
    }
  } shouldBe Pair(
    mapOf("first" to "A", "second" to "B", "third" to "C"),
    mapOf("first" to "1", "second" to "2", "third" to "3")
  )
}