Book Image

Micro State Management with React Hooks

By : Daishi Kato
Book Image

Micro State Management with React Hooks

By: Daishi Kato

Overview of this book

State management is one of the most complex concepts in React. Traditionally, developers have used monolithic state management solutions. Thanks to React Hooks, micro state management is something tuned for moving your application from a monolith to a microservice. This book provides a hands-on approach to the implementation of micro state management that will have you up and running and productive in no time. You’ll learn basic patterns for state management in React and understand how to overcome the challenges encountered when you need to make the state global. Later chapters will show you how slicing a state into pieces is the way to overcome limitations. Using hooks, you'll see how you can easily reuse logic and have several solutions for specific domains, such as form state and server cache state. Finally, you'll explore how to use libraries such as Zustand, Jotai, and Valtio to organize state and manage development efficiently. By the end of this React book, you'll have learned how to choose the right global state management solution for your app requirement.
Table of Contents (16 chapters)
Part 1: React Hooks and Micro State Management
Part 2: Basic Approaches to the Global State
Part 3: Library Implementations and Their Uses

Understanding Context

When a Context provider has a new Context value, all Context consumers receive the new value and re-render. This means the value in the provider is propagated to all the consumers. It is important for us to understand how Context propagation works and its limitations.

How Context propagation works

If you use a Context provider, you can update the Context value. When a Context provider receives a new Context value, it triggers all the Context consumer components to re-render.

It's sometimes the case that a child component re-renders for two reasons—one because of the parent, and the other because of the Context.

To stop re-rendering without Context value changes, in this case, we can use the lift content up technique, or memo. memo is a function to wrap a component and is used to prevent re-renders if the component props don't change.

Let's see an example with some components wrapped with memo to understand its behavior.