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perhaps the easiest tl;dr is to try: http://syzygy.st/javascript-coroutines/#demo

but as for an explanation: it turns out coroutines let you "invert" memory/variable state into control/flow state!

Nice explanation, thank you. I was indeed wondering if having something like a statefull procedure (if I can call it this way, this is a fairly new concept to me) wouldn't make the code more complex; I didn't actually notice that the state is already there, it was just moved to another place.

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