Countdown timer

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setInterval repeats; always keep the id so you can clearInterval it.

Which call stops an interval?

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let n=0;const id=setInterval(()=>{n++;if(n===2){clearInterval(id);console.log('done');}},0);

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let n=0;const id=setInterval(()=>{n++;if(n===2){clearInterval(id);console.log('done');}},0);

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