Scramble.scala

object Scramble {
  val moves = Array("Up", "Down", "Left", "Right", "Front", "Back").map(_.head)
  val orien = Array("2" -> 1, "'" -> 2, "" -> 3).flatMap{case (rot, weight) => 1 to weight map (_ => rot)}
  val rands = orien.flatMap(x => moves.map(_ + x))

  def isNum(num:String) = num forall ('0' to '9' contains _)
  def getRandElemFromArray[T](arr:Array[T]) = arr( util.Random.nextInt(arr.size) )

  def generate(size:Int) = 1 to size map (_ => getRandElemFromArray(rands)) mkString " "
  def scramble(size:String) = if (false == isNum(size)) "Cannot Scramble" else generate(size.toInt)

  def main(av:Array[String]):Unit = av.size match {
    case 0 => println("usage: ./scramble <size>")
    case _ => println( scramble(av.head) )
  }
}