JavaScript clearInterval does not reset setInterval return ID

Question

clearInterval(intervalNumber) clears the timer but if we call setInterval(fn, interval) again it return new higher ID. Is there way to reset the setInterval return ID where from it started. I tried to search but not found any references.

Is this expected ?

var newInterval;
setInterval(() => {
    newInterval = setInterval(() => {
        console.log("New Interval is ", newInterval)
        clearInterval(newInterval);
    }, 500);
}, 1000);

//10
//New Interval is  11
//New Interval is  12
//New Interval is  13
//New Interval is  14
//Can it set to 11 again ?

`Why clearInterval(intervalNumber) does not reset setInterval(fn, interval)` No clue what that means. What are you actually expecting to happen. — epascarello, Nov 21 '19 at 15:35

alireza · Answer 1 · 2019-11-21T15:41:13.507

setInterval(() => {...} has an ID, each time you run it a new ID generates. you run it each second so you are assigning a new ID to newInterval each second. Yes, that's the expected behavior.

If you do not clearInterval it will be the result:

var newInterval;
setInterval(() => {
    newInterval = setInterval(() => {
        console.log("New Interval is ", newInterval)
    }, 500);
}, 1000);
//console.log 
827
New Interval is  839
3 New Interval is  851
5 New Interval is  863
7 New Interval is  876
9 New Interval is  887
11 New Interval is  899

JavaScript clearInterval does not reset setInterval return ID

1 Answers1