componentWillUnmount with React useEffect hook

Question

How can the useEffect hook (or any other hook for that matter) be used to replicate componentWillUnmount?

In a traditional class component I wo

Answer 1

You can make use of useRef and store the props to be used within a closure such as render useEffect return callback method

function Home(props) {
  const val = React.useRef();
  React.useEffect(
    () => {
      val.current = props;
    },
    [props]
  );
  React.useEffect(() => {
    return () => {
      console.log(props, val.current);
    };
  }, []);
  return <div>Home</div>;
}

DEMO

However a better way is to pass on the second argument to useEffect so that the cleanup and initialisation happens on any change of desired props

React.useEffect(() => {
  return () => {
    console.log(props.current);
  };
}, [props.current]);