Book Image

Designing React Hooks the Right Way

By : Fang Jin
Book Image

Designing React Hooks the Right Way

By: Fang Jin

Overview of this book

React hook creates a unique solution for using states in function components to orchestrate UI communication. They provide you with an easy interface to write custom data management solutions with low development and maintenance costs. Understanding how Hooks are designed enables you to use them more effectively, and this book helps you to do just that. This book starts with a custom-crafted solution to reveal why Hooks are needed in the first place. You will learn about the React engine and discover how each built-in Hook can manage a persistent value by hooking into it. You will walk through the design and implementation of each hook with code so that you gain a solid understanding. Finally, you'll get to grips with each Hook's pitfalls and find out how to effectively overcome them. By the end of this React book, you'll have gained the confidence to build and write Hooks for developing functional and efficient web applications at scale.
Table of Contents (12 chapters)

Chapter 7: Use Context to Cover an Area

In the previous chapter, we learned how useMemo is designed and how to use useMemo to conditionally reuse the last value. In this chapter, we will talk about how to propagate changes to cover an area update. We will introduce what an area update is and how React context is used to share a value within that area. Then, we will walk through the data structure and source code behind useContext to consume the shared value. And finally, we'll provide two practical examples of applying contexts to the theme and the table. The chapter also includes two bonus topics in the Appendix section: Propagating a context and Context scope and value.

We will cover the following topics in this chapter:

  • What is an area update?
  • Introducing the React context
  • Understanding the useContext design
  • Test driving useContext
  • useContext examples
  • Questions and answers
  • Appendix