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!

Fragments

Since version React 16.2.0 we are able to return arrays and strings from the render method. Before, React forced us to return an element wrapped with <div> or any other tag; it was not possible to return an array or string directly:

  // Example 1: Returning an array of elements. 

render() {
// Now you don't need to wrap list items in an extra element
return [
<li key="1">First item</li>,
<li key="2">Second item</li>,
<li key="3">Third item</li>
];
}

// Example 2: Returning a string

render() {
return 'Hello World!';
}

Also, React has implemented a new feature called Fragment, which also works as a special wrapper for elements. It can be specified with empty tags (<></>) or directly by using React.Fragment:

  // Example 1: Using empty...