Unzip4 List

Main.scala

import java.net.URI

object Main extends App {
  val list = List((1, URI.create("hello"), "hello", 23.2), (2, URI.create("bye"), "bye", 45.2))
  val (ints, uris, strings, doubles) = list.unzip4
  println(ints)
  println(uris)
  println(strings)
  println(doubles)



  implicit class ListUnzip4[+A](val list: List[A]) extends AnyVal {
    def unzip4[A1, A2, A3, A4](implicit asTuple4: A => (A1, A2, A3, A4)): (List[A1], List[A2], List[A3], List[A4]) = {
      val b1 = List.newBuilder[A1]
      val b2 = List.newBuilder[A2]
      val b3 = List.newBuilder[A3]
      val b4 = List.newBuilder[A4]

      for (abcd <- list) {
        val (a, b, c, d) = asTuple4(abcd)
        b1 += a
        b2 += b
        b3 += c
        b4 += d
      }
      (b1.result(), b2.result(), b3.result(), b4.result())
    }
  }
}