Draw Tic Tac Toe board cells based on array of states

draw-ttt-cells.js

drawCells(boardState){

  boardState.forEach(function(el, i){
    let x = (i % 3) * this.cellSize;
    let y = Math.floor(i/3) * this.cellSize;

    if(el === 1){
      this.drawX(x, y);
    } else if(el === 2){
      this.drawO(x, y);
    }
  }, this);

}