Mancala (6835c79502cd2e0ff49b102769e0fe5776306ec0) - introducing MancalaGame and players

game.js

...
class MancalaGame
{
  constructor(cnvsELID,_updatePlayerCallback)
  {
    requires(_updatePlayerCallback != null,"Must have a player update callback")

    this.board = new Board(CELL_COUNT);
    this.player = PLAYER.one;
    this.updatePlayerCallback = _updatePlayerCallback;
    this.updatePlayerCallback(this.player);

    this.canvas = maybe(initCanvas(cnvsELID));
    this.canvas.ifPresent(cnvs => {
      ...
    })
  }

  handleCellClick(boardCell)
  {
    this.board.playCell(boardCell);
    this.updatePlayerCallback(this.togglePlayer());

    this.canvas.ifPresent(cnvs => {
      drawBoardState(cnvs,this.board,this)
    })
  }

  togglePlayer()
  {
    this.player = this.player.theOtherOne();
    return this.player;
  }
}