setInterval won't repeat?

Question

why has this been associated with the above? I read through those answers after understanding the issue from answers provided below and there's nothing in the above that would have generated any insight.

html doc

let tester = 0;
    setInterval(iterateCounter(), 1000);
    
    function iterateCounter(){
      ++ tester;
      console.log(tester);
    }

this is probably a horrible question but i've checked MDN, JSinfo, and perused stack for about 20 minutes on top of that. Why is this code snippet running once and then not repeating?

Plenty of dupes on this.... () executes it and what is returned is assigned to the interval. In your case you have `setInterval(undefined, 1000);` — epascarello, Aug 26 '20 at 20:51
@epascarello non-specific and unhelpful given A) you didn't reference anything specifically B) the question was already answered C) you offered a code snippet that only makes sense to someone who understood the problem a priori. — cooper kennelly, Aug 26 '20 at 21:00
@epascarello pragmatic > pedantic, the answer below it explains why perfectly explicitly. — cooper kennelly, Aug 27 '20 at 03:16

Majed Badawi · Accepted Answer · 2020-08-26T21:02:50.590

2

You should only pass the function name instead of calling it:

let tester = 0;
setInterval(iterateCounter, 1000);
    
function iterateCounter(){
      ++ tester;
      console.log(tester);
}

For more info, you can check the docs.

edited Aug 26 '20 at 21:02

answered Aug 26 '20 at 20:49

Majed Badawi

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score 0 · Answer 2 · answered Aug 26 '20 at 20:55

setInterval in its first argument accepts function itself, not what function returns. To make it work simply remove scopes after iterateCounter

let tester = 0;
    setInterval(iterateCounter, 1000);
    
    function iterateCounter(){
      ++ tester;
      console.log(tester);
    }

setInterval won't repeat?

2 Answers2