[isak2]

I think Crockford is right about that error.

Declaration of variables in the loop could lead to this type of error:

http://cam.ly/blog/2011/01/javascript-interview-question/

(All of the 4 <li> will do alert('4') when clicked, when the programmer expects alert('1'), alert('2'), etc.)

If the variable had been declared at the top, that error probably would not happen.

[daleharvey]

That error would have happened despite if the var was declared at the top or in the loop

    addEventListener("stuff", function() {
        return function(index) {
            alert(index);
        }
    }(i);

is the fix, either way

[isak2]

Yeah. I meant that the mistake is less likely to have been made in the first place.