What should every JavaScript programmer know?

Question

Is there a set of things that every JavaScript programmer should know to be able to say "I know JavaScript"?

Answer 1

Understanding the stuff written in Crockford's Javascript: The Good Parts is a pretty good assumption that a person is a decent JS programmer.

You can pretty much know how to use a good library like JQuery and still not know the hidden parts of Javascript.

Another note is Debugging tools on various browsers. A JS programmer should know how to debug his code in different browsers.

Oh! And knowing JSLint will totally hurt your feelings!!

Comments

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If you want to be a true JavaScript ninja, you should know the answers to every question in the Perfection kills JavaScript Quiz.

An example to whet your appetite:

(function f(f){
  return typeof f();
})(function(){ return 1; });

    What does this expression return?

        * “number”
        * “undefined”
        * “function”
        * Error