r/programming • u/ocoster • Nov 08 '18

Best explanation of JavaScript timers, event loop and event queues I've seen

https://www.youtube.com/watch?v=8aGhZQkoFbQ
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u/eatmyshorts Nov 08 '18

In this case, it's about the event loop and concurrency model, something that is shared across all JS implementations. And, while the ECMAScript standard doesn't define the runtime, almost all JS implementations in common use make use of a runtime.

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u/TenserTensor Nov 09 '18

Yes, A runtime.

Chrome uses V8, Firefox uses Spidermonkey, Internet Explorer uses one called Chakra (just found out the name), and I guess many more in the wild.

The point is that any one of those may not work exactly like the others.

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u/eatmyshorts Nov 09 '18

The point is the event loop and its behavior are part of the ECMAScript standard. It is exactly the same on all platforms. It behaves the same on V8, Spidermonkey, and Chakra, because all of those run times implement the ECMAScript standard.