arrow-core-data / arrow.core / ListK / padZip

padZip

fun <B> ~~padZip~~(other: ListK<B>): ListK<Tuple2<Option<A>, Option<B>>> Deprecated: Deprecated, use padZipWithNull instead

Align two Lists as in zip, but filling in blanks with None.

fun <B, C> padZip(other: ListK<B>, fa: (A?, B?) -> C): ListK<C>

Returns a ListK containing the result of applying some transformation (A?, B?) -> C on a zip.

Example:

import arrow.core.*

//sampleStart
val padZipRight = listOf(1, 2).k().padZip(listOf("a").k()) { l, r -> l toT r }.k()     // Result: ListK(Tuple2(1, "a"), Tuple2(2, null))
val padZipLeft = listOf(1).k().padZip(listOf("a", "b").k()) { l, r -> l toT r }.k()    // Result: ListK(Tuple2(1, "a"), Tuple2(null, "b"))
val noPadding = listOf(1, 2).k().padZip(listOf("a", "b").k()) { l, r -> l toT r }.k()  // Result: ListK(Tuple2(1, "a"), Tuple2(2, "b"))
//sampleEnd

fun main() {
  println("padZipRight = $padZipRight")
  println("padZipLeft = $padZipLeft")
  println("noPadding = $noPadding")
}