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

unzip

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.*

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

fun <K, A, B, C> Map<K, C>.unzip(fc: (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.*

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