HOOKStypescript

useInterval Hook

Declarative setInterval hook.

import { useEffect, useRef } from 'react';

function useInterval(callback: () => void, delay: number | null) {
  const savedCallback = useRef(callback);
  useEffect(() => { savedCallback.current = callback; }, [callback]);
  useEffect(() => {
    if (delay !== null) {
      const id = setInterval(() => savedCallback.current(), delay);
      return () => clearInterval(id);
    }
  }, [delay]);
}

react hook timer