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)

Understanding Side Effects

Side effects are actions or processes that occur in addition to another "main process". At least, this is a concise definition that helps with understanding side effects in the context of a React app.


You can also look up a more scientific definition here:

In the case of a React component, the main process would be the component render cycle in which the main task of a component is to render the user interface that is defined in the component function (the returned JSX code). The React component should return the final JSX code, which is then translated into DOM-manipulating instructions.

For this, React considers state changes as the trigger for updating the user interface. Registering event handlers such as onClick, adding refs, or rendering child components (possibly by using props) would be other elements that belong to this main process—because all...