Book Image

React Design Patterns and Best Practices. - Second Edition

Book Image

React Design Patterns and Best Practices. - Second Edition

Overview of this book

React is an adaptable JavaScript library for building complex UIs from small, detached bits called components. This book is designed to take you through the most valuable design patterns in React, helping you learn how to apply design patterns and best practices in real-life situations. You’ll get started by understanding the internals of React, in addition to covering Babel 7 and Create React App 2.0, which will help you write clean and maintainable code. To build on your skills, you will focus on concepts such as class components, stateless components, and pure components. You'll learn about new React features, such as the context API and React Hooks that will enable you to build components, which will be reusable across your applications. The book will then provide insights into the techniques of styling React components and optimizing them to make applications faster and more responsive. In the concluding chapters, you’ll discover ways to write tests more effectively and learn how to contribute to React and its ecosystem. By the end of this book, you will be equipped with the skills you need to tackle any developmental setbacks when working with React. You’ll be able to make your applications more flexible, efficient, and easy to maintain, thereby giving your workflow a boost when it comes to speed, without reducing quality.
Table of Contents (19 chapters)
Free Chapter
1
Section 1: Hello React!
4
Section 2: How React works
9
Section 3: Performance, Improvements and Production!

Keys

This problem can of course be solved and the way for this is the key attribute which is supported by React. Children posses keys and these keys are used by React to match children between the subsequent tree and the original tree. The tree conversion can be made efficient by adding a key to our previous example:

  <ul>
<li key="2018">Carlos</li>
<li key="2019">Javier</li>
</ul>

<ul>
<li key="2017">Jona</li>
<li key="2018">Carlos</li>
<li key="2019">Javier</li>
</ul>

React now knows that 2017 key is the new one and the 2018 and 2019 keys have just moved.

Finding a key is not hard. The element that you will be displaying might already have a unique ID. So the key can just come from your data:

  <li key={element.id}>{element...