Scala flatten List

Question

I want to write a function that flats a List.

object Flat {
  def flatten[T](list: List[T]): List[T] = list match {
    case Nil => Nil
    case head :: N         


        

Answer 1

My, equivalent to SDJMcHattie's, solution.

  def flatten(xs: List[Any]): List[Any] = xs match {
    case List() => List()
    case (y :: ys) :: yss => flatten(y :: ys) ::: flatten(yss)
    case y :: ys => y :: flatten(ys)
  }