Book Image

React 17 Design Patterns and Best Practices - Third Edition

By : Carlos Santana Roldán
2 (1)
Book Image

React 17 Design Patterns and Best Practices - Third Edition

2 (1)
By: Carlos Santana Roldán

Overview of this book

Filled with useful React patterns that you can use in your projects straight away, this book will help you save time and build better web applications with ease. React 17 Design Patterns and Best Practices is a hands-on guide for those who want to take their coding skills to a new level. You’ll spend most of your time working your way through the principles of writing maintainable and clean code, but you’ll also gain a deeper insight into the inner workings of React. As you progress through the chapters, you’ll learn how to build components that are reusable across the application, how to structure applications, and create forms that actually work. Then you’ll build on your knowledge by exploring how to style React components and optimize them to make applications faster and more responsive. Once you’ve mastered the rest, you’ll learn how to write tests effectively and how to contribute to React and its ecosystem. By the end of this book, you'll be able to avoid the process of trial and error and developmental headaches. Instead, you’ll be able to use your new skills to efficiently build and deploy real-world React web applications you can be proud of.
Table of Contents (21 chapters)
1
Hello React!
4
How React Works
10
Performance, Improvements, and Production!
19
About Packt

Keys

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

React now knows that the 2017 key is the new one and that 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.title}</li>

A new ID can be added to your model by you, or the key can be generated by some parts of the content. The key has to only be unique among its siblings; it does not have to be unique globally. An item...