Sometimes, we want to call a function periodically in JavaScript.

In this article, we’ll look at how to call a function periodically in JavaScript.

How to call a function periodically in JavaScript?

To call a function periodically in JavaScript, we call the setInterval function.

For instance, we write

const intervalId = setInterval(() => {
  console.log("Interval reached every 5s");
}, 5000);

to call setInterval with a callback that runs every 5 seconds.

We specify the period with the 2nd argument in milliseconds.

setInterval returns the ID number of the timer.

And we can use clearInterval with the timer ID number to stop the timer.

Conclusion

To call a function periodically in JavaScript, we call the setInterval function.