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

Chapter 4: Sharing Module State with Subscription

In the previous chapter, we learned how to use Context for a global state. As discussed, Context is not designed for the singleton pattern; it's a mechanism for avoiding the singleton pattern and providing different values for different subtrees. For a singleton-like a global state, using a module state makes more sense because it's a singleton value in memory. The goal of this chapter is to learn to use a module state with React. It's a less well-known pattern than Context, but is often used to integrate the existing module state.

What Is a Module State?

A strict definition of a module state would be some constants or variables defined in ECMAScript (ES) module scopes. In this book, we aren't following the strict definition. You can simply assume that a module state is a variable defined globally or within the scope of a file.

We'll explore how to use a module state as a global state in React. In order...