ScalaでListのshuffle

scala.util.Randomを使う。

scala> scala.util.Random.shuffle(List(1,2,3,4,5))
res0: List[Int] = List(3, 5, 4, 2, 1)

scala> scala.util.Random.shuffle(List(1,2,3,4,5))
res1: List[Int] = List(5, 4, 1, 2, 3)