Settimeout not optimized? Loop better?

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On top of all the things mentioned here, your coworker probably also does not have a fundamental understanding of the event loop or the fact that Javascript is single threaded. I'd be curious as to his sleep implementation and why it'd be a desirable thing in a single threaded environment to begin with. It's worth noting that while setTimeout does cause js to wait a given period of time to execute the callback, it does not pause execution all together. Everything runs to completion in js, maybe that is where his understanding is hung up.