how to use useeffect in react when change state code example

Example 1: react useeffect on change props

useEffect(() => console.log('value changed!'), [props.isOpen]);

Example 2: useeffect on update

const isInitialMount = useRef(true);

useEffect(() => {
  if (isInitialMount.current) {
     isInitialMount.current = false;
  } else {
      // Your useEffect code here to be run on update
  }
});