javascript - What are some real world uses for function.toString()?

Question

I've noticed in JavaScript that if you define a function, say myfunction(), and then call myfunction.toString(), you get the text of the source for that function. Are there any interesting/real world uses of this?

Answer 1

Well, you can use it to easily redefine a function:

function x() { alert('asdf'); }
eval(x.toString().replace('asdf','hello'));
x();

This will alert the string "hello" instead of the string "asdf".

This may be useful. On the other hand, self modifying code is often frowned upon because of the difficulty to maintain it...