It’s a common begginer’s developer mistake to write some fullish debug info like “i’m in the IF”, or even worse – “test”. Of course when debugging you don’t get any aditional information. You know only that – you’re in the IF statement!? What a good news! That doesn’t tell you much, isn’t it?

Another bad way to debug is to dump only ids from some database table or loop index. At least write something before that, something like:

alert('on the: ' + index + ' happened something!');

that gives you more and can improve your work so much.