arrow-fx-coroutines / arrow.fx.coroutines.stream / Stream / zipWithPrevious

zipWithPrevious

fun zipWithPrevious(): Stream<Pair<O?, O>>

Zips each element of this stream with the previous element wrapped into Some. The first element is zipped with None.

import arrow.fx.coroutines.stream.*

//sampleStart
suspend fun main(): Unit =
  Stream("The", "quick", "brown", "fox")
  .zipWithPrevious()
  .toList()
  .let(::println) //[(null,The), (The,quick), (quick,brown), (brown,fox)]
//sampleEnd