componentWillReceiveProps, componentDidUpdate for React Hook

Question

I run into two challenges:

• Even if, as per React guideline, derived state is discouraged, but some edge cases still need it.
  In terms of

Answer 1

simply by using useEffect like this.

useEffect( () => {
    props.actions.fetchSinglePost(props.match.params.id); //> I'm dispatching an action here.
}, [props.comments]) //> and here to watch comments and call the action in case there is any change.