Why callback function still delay even after the setting timeout to 0

Question

console.log(10);
setTimeout(()=>{console.log(20),0});
console.log(30);

Why the callback timeout function still delays in output?

Are you asking why you get the output like 10... 30... 20... instead of 10... 20... 30... ? — Olli, Jan 18 '21 at 10:09
https://stackoverflow.com/questions/33955650/what-is-settimeout-doing-when-set-to-0-milliseconds/33955673 maybe this is helpful for you — Aalexander, Jan 18 '21 at 10:10
https://developer.mozilla.org/en-US/docs/Web/API/WindowOrWorkerGlobalScope/setTimeout — Gabriele Petrioli, Jan 18 '21 at 10:11
@PinkleshParjapati the link from alex explains it very well. Check the first answere — Olli, Jan 18 '21 at 10:12

score 0 · Answer 1 · answered Jan 18 '21 at 10:13

0

setTimeout() is asynchronous and that means that even if you set timer to zero, it will still be done after all of your code. Search asynchronous function to learn more.

answered Jan 18 '21 at 10:13

Andreja Zivanovic

79
1
8

1

`setTimeout` itself is not asynchronous, the timer it sets is. – Teemu Jan 18 '21 at 10:16

Why callback function still delay even after the setting timeout to 0

1 Answers1