Simplified Timers with `useInterval` React Hook

import { useEffect, useRef } from 'react';

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

  // Remember the latest callback.
  useEffect(() => {
    savedCallback.current = callback;
  }, [callback]);

  // Set up the interval.
  useEffect(() => {
    function tick() {
      savedCallback.current();
    }
    if (delay !== null) {
      let id = setInterval(tick, delay);
      return () => clearInterval(id);
    }
  }, [delay]);
}

How it works: The `useInterval` hook simplifies using `setInterval` in React components by handling cleanup automatically. It takes a `callback` function and a `delay`. The `useRef` hook stores the latest `callback` to prevent stale closures, ensuring that the interval always executes the most current version of your function. The `useEffect` then sets up the interval, clearing it when the component unmounts or the `delay` changes, ensuring efficient and bug-free timer management.