Cross product in Scala

Question

I want to have a binary operator cross (cross-product/cartesian product) that operates with traversables in Scala:

val x = Seq(1, 2)
val y = Lis         


        

Answer 1

Similar to other responses, just my approach.

def loop(lst: List[List[Int]],acc:List[Int]): List[List[Int]] = {
  lst match {
    case head :: Nil => head.map(_ :: acc)
    case head :: tail => head.flatMap(x => loop(tail,x :: acc))
    case Nil => ???
  }
}
val l1 = List(10,20,30,40)
val l2 = List(2,4,6)
val l3 = List(3,5,7,9,11)

val lst = List(l1,l2,l3)

loop(lst,List.empty[Int])