List Insertion Sort

ListSort.scala

object ListSort {
   def isort(xs: List[Int]): List[Int] =
      if (xs.isEmpty) Nil
      else insert(xs.head, isort(xs.tail))
      
   def insert(head: Int, xs: List[Int]): List[Int] = 
      if (xs.isEmpty) List(head)
      else if (head > xs.head) xs.head :: insert(head, xs.tail)
      else head :: xs
   def main(args: Array[String]) {
      val l = List(6,4,8,12,1,7,22,10)
      println("List is: " + l)
      println("Sorted List is: " + isort(l))
   }
}