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Re: setTimeOut and lag adding up.

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From Arno Welzel <usenet@arnowelzel.de>
Newsgroups comp.lang.javascript
Subject Re: setTimeOut and lag adding up.
Date Thu, 11 Mar 2021 12:57:34 +0100
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Jonas Thörnvall:

> I have a question i shift some 12 000 note events.
> During 5 min 48 seconds.
> 
> That cause ca 30 seconds of lag in the shift sequence of note intervals/timeout lengths. I could understand the delay add up to some 1000 ms, but 30 000?????
> 
> Can that really be reasonable?

Yes. Because setTimeout() will start a timer at the point when it is
called. When the handler then needs 0.0025 seconds to deal with the
event before the next setTimeout() call is done this sums up to 30
seconds for 12000 events.

What you need is setInterval() and clearInterval():

<https://developer.mozilla.org/en-US/docs/Web/API/WindowOrWorkerGlobalScope/setInterval>

<https://developer.mozilla.org/en-US/docs/Web/API/WindowOrWorkerGlobalScope/clearInterval>


This call will cause a function to be called *exactly* every n
milliseconds, regardless how long this function will take to handle the
call. So also make sure that the function will not take longer than the
interval is.

Also keep in mind that you do NOT call setInterval() again! You call
that only ONCE to start the repeated interval calls and to stop it again
you use clearInterval() using the ID which you got from setInterval().


-- 
Arno Welzel
https://arnowelzel.de

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Thread

setTimeOut and lag adding up. Jonas Thörnvall <jonas.thornvall@gmail.com> - 2021-03-10 08:41 -0800
  Re: setTimeOut and lag adding up. Jonas Thörnvall <jonas.thornvall@gmail.com> - 2021-03-10 08:46 -0800
    Re: setTimeOut and lag adding up. Jonas Thörnvall <jonas.thornvall@gmail.com> - 2021-03-10 09:01 -0800
    Re: setTimeOut and lag adding up. Jonas Thörnvall <jonas.thornvall@gmail.com> - 2021-03-10 09:31 -0800
      Re: setTimeOut and lag adding up. JJ <jj4public@gmail.com> - 2021-03-11 14:01 +0700
  Re: setTimeOut and lag adding up. Arno Welzel <usenet@arnowelzel.de> - 2021-03-11 12:57 +0100
    Re: setTimeOut and lag adding up. Silvio <silvio@internet.com> - 2021-03-11 14:17 +0100
      Re: setTimeOut and lag adding up. Jonas Thörnvall <jonas.thornvall@gmail.com> - 2021-03-11 06:07 -0800
        Re: setTimeOut and lag adding up. Silvio <silvio@internet.com> - 2021-03-11 16:03 +0100
          Re: setTimeOut and lag adding up. Jonas Thörnvall <jonas.thornvall@gmail.com> - 2021-03-11 07:47 -0800
    Re: setTimeOut and lag adding up. Jonas Thörnvall <jonas.thornvall@gmail.com> - 2021-03-11 05:54 -0800
    Re: setTimeOut and lag adding up. Jonas Thörnvall <jonas.thornvall@gmail.com> - 2021-03-11 06:13 -0800

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