The useDispatch Hook returns a reference to the dispatch function that is provided by the Redux store. It can be used to dispatch actions that are returned from action creators. Its API looks as follows:
const dispatch = useDispatch()
We are now going to use the Dispatch Hook to replace the existing container components with Hooks.
You do not need to migrate your whole Redux application at once in order to use Hooks. It is possible to selectively refactor certain components—meaning that they will use Hooks—while still using connect() for other components.
After learning how to use the Dispatch Hook, let's move on to migrating our existing components so that they use the Dispatch Hook.