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From a good post on JavaScript, threading, and Ruby.

When you use XMLHttpRequest to fetch or send data, you create methods or functions to act as callbacks. At some point the callbacks are run, and data magically appears into your classes. That feels a lot like threading to me, the fact it’s asynchronous. I remember reading Thomas Fuchs saying something about JavaScript being single-threaded, a quick search found the comment: [Rails-spinoffs] Ajax.Request synchronization (onSuccess beforeonComplete?).

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Read more from this blogger: JavaScript and threads: A browser dismantling session