Scala Intuition

package com.foo

object TicTacToe {

  trait Piece
  case object X extends Piece
  case object O extends Piece
  case object E extends Piece

  sealed trait ColumnCoordinate
  case object COL1 extends ColumnCoordinate
  case object COL2 extends ColumnCoordinate
  case object COL3 extends ColumnCoordinate

  sealed trait RowCoordinate
  case object ROW1 extends RowCoordinate
  case object ROW2 extends RowCoordinate
  case object ROW3 extends RowCoordinate

  type Row = Map[ColumnCoordinate, Piece]
  type Board = Map[RowCoordinate, Row]

  /*class Boardx {
    private val grid = Array(Array(X, X, X), Array(X, X, X), Array(X, X, X))
  }

  case class Move(coordinates: (ColumnCoordinate, RowCoordinate), piece: Piece)

  val er = Map(
    COL1 -> E,
    COL2 -> E,
    COL3 -> E)

  val bd = Map(
    ROW1 -> er,
    ROW2 -> er,
    ROW3 -> er
  )*/

  def move (board:Board, col: ColumnCoordinate, row: RowCoordinate, value:Piece) : Board = {
    board.updated(row, board(row).updated(col, value))
  }
}


object Thing {

  /*val bd = Board(
    Row(E, E, E),
    Row(E, E, E),
   Row(E, E, E))

  import TicTacToe._
  val er = (
    COL1 -> E,
    COL2 -> E,
    COL3 -> E)
  val bd = Map(
    ROW1 -> er,
    ROW2 -> er,
    ROW3 -> er
  )*/
}