random

gistfile1.scala

def shuffle[T](t: Int, l: List[T]): List[T] = (t,l) match { 
  case (0, _) => Nil
  case (x, Nil) => Nil
  case (x, ls) => { 
    import scala.util.Random
    val r = ls(Random.nextInt(ls.length))
    r :: shuffle(x-1, ls.filterNot(item => item == r))
  }
}

===============================================
scala> val list = ('a' to 'z').toList
list: List[Char] = List(a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z)

scala> shuffle(10, list)
res0: List[Char] = List(a, m, b, k, w, f, t, s, c, q)