useInterval

maidangzhu

The code uses a function call to call a stored function, and then uses an event handler to call the stored function every delay milliseconds.

Library: react

import { useRef, useEffect } from "react";

function useInterval(callback, delay) {
  const savedCallback = useRef();

  useEffect(() => {
    savedCallback.current = callback;
  });

  useEffect(() => {
    function tick() {
      savedCallback.current();
    }

    if (delay !== null) {
      let id = setInterval(tick, delay);
      return () => clearInterval(id);
    }
  }, [delay]);
}