chess.js

var createChess = function (width, height){
	for(var i = 1; i <= height; i++){
        var line = "";
    	for(var j = 0; j < width; j++){
          var newChar = "";
          if(i % 2 == 0){
            newChar = (j % 2) == 0 ? "#" : " ";
          } else {
            newChar = (j % 2) != 0 ? "#" : " ";
          } 
          line += newChar;
        }
      console.log(line);
    }
}

createChess(8,8);