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From: Ben Bacarisse <ben.usenet@bsb.me.uk>
Newsgroups: comp.lang.javascript
Subject: Re: Serialise setInterval
Date: Thu, 20 May 2021 03:00:03 +0100
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Jonas Thörnvall <jonas.thornvall@gmail.com> writes:

> onsdag 19 maj 2021 kl. 22:05:19 UTC+2 skrev Jonas Thörnvall:
>> Can someone give a minimalistic example on howto serialise two setIntervals? 
>> "To some sort of accuracy"
> Can someone tell why this approach would not work?
> function countIn(){
> REALTIME=(performance.now()-browserLoadTIME)-2400;	
>   	if (REALTIME<0){ 
> 			stopCount=setInterval(countIn,600);
> 	} else {
> 			clearInterval(stopCount);
> 			stopRec=setInterval(recSomeNotes,5);		 
> 	}
> }

This looks very odd.  It's possible that you create multiple interval
timers (before you find that REALTIME >= 0), but you only store the ID of
the last one, so all but that one can't be cancelled.

It appears that you want to keep checking some time to take action later
in the else clause.  Can't you calculate when REALTIME will become >= 0?
Then you could use setTimeout.

Please learn to use local variables.

-- 
Ben.