HelloWorld.scala

object HelloWorld {
    def quickSort(list : List[Double]) : List[Double] =
        list match {
            case Nil     => Nil
            case List(x) => list
            case x :: xs => quickSort(xs filter (x >=)) ::: List(x) ::: quickSort(xs filter (x <))
        }

    println(quickSort(List(3,1,4,1,5,9,2)))
    println("Hello, world!")
}

HelloWorld