text: (function(exports){
  function Grid() {
    this.grid = [[null, null, null], [null, null, null], [null, null, null]];
  }
  
  Grid.prototype.setGrid = function(){
    return this.grid;
  };
  
  Grid.prototype.place = function(x, y, symbol) {
    this.grid[x][y] = symbol;
  };
  
  Grid.prototype.isFieldTaken = function(x,y){
    if(this.grid[x][y] !== null){
      return true;
    }
  };
  exports.Grid = Grid;
  })(this);
  