Book Image

Professional JavaScript

By : Hugo Di Francesco, Siyuan Gao, Vinicius Isola, Philip Kirkbride
Book Image

Professional JavaScript

By: Hugo Di Francesco, Siyuan Gao, Vinicius Isola, Philip Kirkbride

Overview of this book

In depth knowledge of JavaScript makes it easier to learn a variety of other frameworks, including React, Angular, and related tools and libraries. This book is designed to help you cover the core JavaScript concepts you need to build modern applications. You'll start by learning how to represent an HTML document in the Document Object Model (DOM). Then, you'll combine your knowledge of the DOM and Node.js to create a web scraper for practical situations. As you read through further lessons, you'll create a Node.js-based RESTful API using the Express library for Node.js. You'll also understand how modular designs can be used for better reusability and collaboration with multiple developers on a single project. Later lessons will guide you through building unit tests, which ensure that the core functionality of your program is not affected over time. The book will also demonstrate how constructors, async/await, and events can load your applications quickly and efficiently. Finally, you'll gain useful insights into functional programming concepts such as immutability, pure functions, and higher-order functions. By the end of this book, you'll have the skills you need to tackle any real-world JavaScript development problem using a modern JavaScript approach, both for the client and server sides.
Table of Contents (12 chapters)


In this chapter, we looked at aspects of code quality with an emphasis on automated testing. We started with the basics of clear naming and getting familiar with the industry-wide conventions of the language. By following these conventions and writing clearly, we're able to make our code more readable and reusable.

Building from there, we looked at how linting and testing commands can be created with Node.js using a handful of popular tools, including Prettier, ESLint, Jest, Puppeteer, and Husky.

In addition to setting up tests, we talked about the categories of tests and their use cases. We went through unit tests that ensure that individual functions are working as expected, and integration tests that combine multiple functions or aspects of a program to ensure things are working together. Then, we performed end-to-end tests, which open the application's interface and interact with it as an end-user would.

Finally, we looked at how we can tie it all together...