After learning about actions, reducers, and the Reducer Hook, we are going to implement them in our blog app. Any existing State Hook can be turned into a Reducer Hook, when the state object or state changes become too complex.
If there are multiple setState functions that are always called at the same time, it is a good hint that they should be grouped together in a single Reducer Hook.
Global state is usually a good candidate for using a Reducer Hook, rather than a State Hook, because global-state changes can happen anywhere in the app. Then, it is much easier to deal with actions, and update the state-changing logic only in one place. Having all the state-changing logic in one place makes it easier to maintain and fix bugs, without introducing new ones by forgetting to update the logic everywhere.
We are now going to turn some of the existing State Hooks in our blog app into Reducer Hooks.