old_contents: var Game = function(boardString){
    this.board = '';
    if (arguments.length === 1) {
      this.board = boardString;
    } else {
      function random() {
        return Math.floor(Math.random() * 10 + 6);
      };
      var firstTwo = random();
      var secondTwo = random();
      for ( var i = 0; i < 16; i++ ) {
        if (i === firstTwo || i === secondTwo) {
          this.board += '2';
        } else {
          this.board += '0';
        };
      };
    }
  };
  
  Game.prototype.toString = function() {
    this.board.
  };
  
new_contents: var Game = function(boardString){
    var board = '';
    this.board = '';
    if (arguments.length === 1) {
      this.board = this.toArray(boardString);
    } else {
      function random() {
        return Math.floor(Math.random() * 10 + 6);
      };
      var firstTwo = random(), secondTwo = random();
      for ( var i = 0; i < 16; i++ ) {
        if (i === firstTwo || i === secondTwo) {
          board += '2';
        } else {
          board += '0';
        };
      };
      this.board = this.toArray(board);
    }
  };
  
  Game.prototype = {
  
    toString: function() {
      for( var i = 0; i < 16; i += 4){
        this.array = this.board.slice(0 + i, 4 + i)
        console.log(this.array)
      }
    },
  
    toArray: function(chars) {
      var boardArray = [];
      for( var i = 0; i < 16; i += 4) {
        var subarray = chars.slice(0 + i, 4 + i);
        boardArray.push(subarray.split(''));
      }
      return boardArray;
    }
  };
  
  
subject: Add toArray method