ランダムに2チームへ分けるスクリプト scala編

gistfile1.scala

import scala.util.Random

object lunch_script {
  def main(args: Array[String]) : Unit = {
    val splitMember = shuffleAndSplit(args.toList, 20121018)
    println(splitMember._1)
    println(splitMember._2)
  }

  def shuffleAndSplit(member: List[String], date: Long) : (List[String], List[String]) = {
    val random = new Random(date)
    val shuffled = random.shuffle(member)
    split(shuffled, true)
  }

  def split(member: List[String], nextTeamIsFirst: Boolean) : (List[String], List[String]) = {
    member match {
      case List() => (List.empty[String], List.empty[String])
      case _ =>
        val r = split(member.tail, !nextTeamIsFirst)
        if (nextTeamIsFirst)
          (member.head :: r._1, r._2)
        else
          (r._1, member.head :: r._2)
    }
  }
}