​

​

(function printBoard(board) {

  var board = [[1, 2, 3], [1, 2 ,3]];

    var toPrint = "";

​

    for (var i = 0; i < board.length; i++) {

        for (var j = 0; j < board.length; j++) {

         toPrint += board[i][j] + " ";

        }

        toPrint += "<br>";

    }

    document.getElementById("printBoard").innerHTML = toPrint;

})();