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Comment by judofyr | Hacker News Reader

    There is no way of doing I/O in JavaScript's traditional browser environment
    without providing a callback argument.

What about `window.prompt`? Or `document.write`?

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http://www.boctaoe.com/

(Man, I just learned about this site five minutes ago and it's already useful!)

I would hardly call window.prompt and document.write i/o since they never hit disk or network (to over-simplify). They're more like manipulating an object in memory.

For real i/o in JavaScript, look at AJAX: Callback based.

Conversely, some might say that input from the user and output to the user are really the only important i/o.

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