class Board(board: List[Char]) {
  val lines = List(
    (0, 1, 2), (3, 4, 5), (6, 7, 8),
    (0, 3, 6), (1, 4, 7), (2, 5, 8),
    (0, 4, 8), (2, 4, 6)
  )

  var winner = ' '

  def showWinner {
    check
    println(winner)
  }

  def check {
    for(i <- 0 until lines.length) {
      var piece = board(lines(i)._1)
      if (piece != ' ' && piece == board(lines(i)._2) && piece == board(lines(i)._3)) {
        winner = piece
        return
      }
    }
  }
}

val board = new Board(List('O', ' ', ' ', ' ', 'O', ' ', 'X', 'X', 'O'))
board.showWinner