Chapter 5: Sharing Component State with Context and Subscription

In the previous two chapters, we learned how to use Context and Subscription for a global state. Each has different benefits: Context allows us to provide different values for different subtrees, while Subscriptions prevent extra re-renders.

In this chapter, we will learn a new approach: combining React Context and Subscriptions. The combination will give us the benefits of each, which means:

• Context can provide a global state to a subtree and the Context provider can be nested. Context allows us to control a global state in the React component lifecycle like the useState hook.
• On the other hand, Subscriptions allow us to control re-renders, which is not possible with a single Context.

Having the benefits of both can be a good solution for larger apps – because, as mentioned, this means we can have different values in different subtrees, and we can also avoid extra re-renders.

This approach...