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)


Here are some questions and answers to refresh your knowledge:

  1. What is useMemo?

    A useMemo hook is an assignment statement where a new value is created when one of the dependencies changes. It can be used to minimize the creation of a value, so it behaves like that sometimes when an assignment is "skipped."

  2. What's the common usage of useMemo?

    It's mainly used as an optimization to avoid heavy operation on every render otherwise. If a certain evaluation is excessively used, thus blocking the UI, it is the right time to think about using useMemo to limit the usage to only relevant conditions. For instance, if typing isn't related to that task, we can take it out of the dependency list.

  3. How do you use useMemo for memorization?

    useMemo doesn't remember all past values and only remembers the last created value. So, the best usage of it is to use it as a special assignment replacement, instead of a caching mechanism.