Book Image

Full Stack Development with Spring Boot 3 and React - Fourth Edition

By : Juha Hinkula
5 (1)
Book Image

Full Stack Development with Spring Boot 3 and React - Fourth Edition

5 (1)
By: Juha Hinkula

Overview of this book

If you’re an existing Java developer who wants to go full stack or pick up another frontend framework, this book is your concise introduction to React. In this three-part build-along, you’ll create a robust Spring Boot backend, a React frontend, and then deploy them together. This new edition is updated to Spring Boot 3 and includes expanded content on security and testing. For the first time ever, it also covers React development with the in-demand TypeScript. You’ll explore the elements that go into creating a REST API and testing, securing, and deploying your applications. You’ll learn about custom Hooks, third-party components, and MUI. By the end of this book, you'll be able to build a full stack application using the latest tools and modern best practices.
Table of Contents (23 chapters)
1
Part I: Backend Programming with Spring Boot
8
Part II: Frontend Programming with React
14
Part III: Full Stack Development
21
Other Books You May Enjoy
22
Index

Useful ES6 features

ES6 was released in 2015, and it introduced a lot of new features. ECMAScript is a standardized scripting language, and JavaScript is one implementation of it. In this section, we will go through the most important features released in ES6 that we will be using in the following sections.

Constants and variables

Constants, or immutable variables, can be defined by using a const keyword, as shown in the following code snippet. When using the const keyword, the variable content cannot be reassigned:

const PI = 3.14159;

Now, you will get an error if you try to reassign the PI value, as indicated in the following screenshot:

Figure 7.4 – Assignment to constant variable

Figure 8.4: Assignment to constant variable

The const is block-scoped. This means that the const variable can only be used inside the block in which it is defined. In practice, the block is the area between curly brackets {}. If const is defined outside of any function or block, it becomes a global variable, and you...