Book Image

React Key Concepts

By : Maximilian Schwarzmüller
Book Image

React Key Concepts

By: Maximilian Schwarzmüller

Overview of this book

As the most popular JavaScript library for building modern, interactive user interfaces, React is an in-demand framework that’ll bring real value to your career or next project. But like any technology, learning React can be tricky, and finding the right teacher can make things a whole lot easier. Maximilian Schwarzmüller is a bestselling instructor who has helped over two million students worldwide learn how to code, and his latest React video course (React — The Complete Guide) has over six hundred thousand students on Udemy. Max has written this quick-start reference to help you get to grips with the world of React programming. Simple explanations, relevant examples, and a clear, concise approach make this fast-paced guide the ideal resource for busy developers. This book distills the core concepts of React and draws together its key features with neat summaries, thus perfectly complementing other in-depth teaching resources. So, whether you've just finished Max’s React video course and are looking for a handy reference tool, or you've been using a variety of other learning materials and now need a single study guide to bring everything together, this is the ideal companion to support you through your next React projects. Plus, it's fully up to date for React 18, so you can be sure you’re ready to go with the latest version.
Table of Contents (16 chapters)

Custom Hooks: A Flexible Feature

The two independent states of Demo1 and Demo2 show a very important feature of custom Hooks: you use them to share logic, not to share state. If you needed to share state across components, you would do so with React context (see the previous chapter).

When using Hooks, every component uses its own "instance" (or "version") of that Hook. It's always the same logic, but any state or side effects handled by a Hook are handled on a per-component basis.

It's also worth noting that custom Hooks can be stateful but don't have to be. They can manage state via useState() or useReducer(), but you could also build custom Hooks that only handle side effects (without any state management).

There's only one thing you implicitly have to do in custom Hooks: you must use some other React Hook (custom or built-in). This is because, if you didn't include any other Hook, there would be no need to build a custom...