Book Image

React Design Patterns and Best Practices

By : Michele Bertoli
Book Image

React Design Patterns and Best Practices

By: Michele Bertoli

Overview of this book

Taking a complete journey through the most valuable design patterns in React, this book demonstrates how to apply design patterns and best practices in real-life situations, whether that’s for new or already existing projects. It will help you to make your applications more flexible, perform better, and easier to maintain – giving your workflow a huge boost when it comes to speed without reducing quality. We’ll begin by understanding the internals of React before gradually moving on to writing clean and maintainable code. We’ll build components that are reusable across the application, structure applications, and create forms that actually work. Then we’ll style React components and optimize them to make applications faster and more responsive. Finally, we’ll write tests effectively and you’ll learn how to contribute to React and its ecosystem. By the end of the book, you’ll be saved from a lot of trial and error and developmental headaches, and you will be on the road to becoming a React expert.
Table of Contents (19 chapters)
React Design Patterns and Best Practices
About the Author
About the Reviewer
Customer Feedback

Mutating the state

React comes with a very clear and straightforward API to mutate the internal state of components. Using the setState function, we can tell the library how we want the state to be changed. As soon as the state is updated, React re-renders the component and we can access the new state through the this.state property. That's it.

Sometimes, however, we could make the mistake of mutating the state object directly, leading to dangerous consequences for the component's consistency and performance.

First of all, if we mutate the state without using setState, two bad things can happen:

  • The state changes without making the component re-render

  • Whenever setState gets called in future, the mutated state gets applied

If we go back to the counter example and change the click handler to:

handleClick() { 

We can see how clicking + does not affect the rendered value in the browser but, if we look into the component using the React Developer Tools, the value...