It produced a lot of headaches. And yes, it has been described already that
as a lot of articles I read about async in JavaScript, especially those that came out around the time ES2015 (ES6) was new, are just plain wrong. I’m going to clear up the falsehood by presenting a real understanding of the way async works in JavaScript.
Some nice examples are at medium.com and freecodecamp as well as a vid at youtube
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At the end – I have some working code here, that shouldn’t work according to my understanding of concurrency.