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)

Summary

In this chapter, we've explored concepts of modular design, ES6 modules, and their use with node. The principles of object-oriented design can be useful when designing programs that have several layers of modules composed as a complex system.

ES6 classes allow us to create classes much more easily than previous versions of JavaScript. These classes can be built by using the extends keyword. This allows for layers of complexity where more complex objects can be built on top of simple ones and so on.

We also saw how the new ES6 WeakMap type allows us to create private variables. This pattern limits the number of errors in modules that will be used by others. For example, by requiring properties to be changed, we can check the format and value before allowing the change. This was the case with the light example, where we wanted to check that state was a Boolean value before allowing it to be set. We did this by creating getter and setter methods for each private variable...