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 when to use local states

Before we consider React, let's see how JavaScript functions work. JavaScript functions can either be pure or impure. A pure function depends only on its arguments and returns the same value as long as the arguments are the same. A state holds a value outside arguments, and functions that depend on the state become impure. React components are also functions and can be pure. If we use a state in a React component, it will be impure. However, if the state is local to the component, it doesn't affect other components, and we call this characteristic "contained."

In this section, we learn JavaScript functions, and how similar React components are to JavaScript functions. We then discuss how a local state is conceptually implemented.

Functions and arguments

In JavaScript, a function takes an argument and returns a value. For example, here's 
a simple function:

const addOne = (n) => n + 1;

This is a...