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

align

fun <K, A, B> Map<K, A>.align(b: Map<K, B>): Map<K, Ior<A, B>>

Combines two structures by taking the union of their shapes and using Ior to hold the elements.

import arrow.core.*

fun main(args: Array<String>) {
  //sampleStart
  val result =
   mapOf("1" to 1, "2" to 2).align(mapOf("1" to 1, "2" to 2, "3" to 3))
  //sampleEnd
  println(result)
}

fun <K, A, B, C> Map<K, A>.align(b: Map<K, B>, fa: (Entry<K, Ior<A, B>>) -> C): Map<K, C>

Combines two structures by taking the union of their shapes and combining the elements with the given function.

import arrow.core.*

fun main(args: Array<String>) {
  //sampleStart
  val result =
   mapOf("1" to 1, "2" to 2).align(mapOf("1" to 1, "2" to 2, "3" to 3)) { (_, a) ->
     "$a"
   }
  //sampleEnd
  println(result)
}