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)

Introduction

HTML started as a markup language for static documents that was easy to use and could be written using any text editor. After JavaScript became a major player in the internet world, there was a need to expose the HTML documents to the JavaScript runtime. That's when the DOM, was created. The DOM is HTML mapped to a tree of objects that can be queried and manipulated using JavaScript.

In this chapter, you'll learn what the DOM is and how to use JavaScript to interact with it. You'll learn how to find elements and data in a document, how to manipulate elements states, and how to modify their content. You'll also learn how to create DOM elements and append them to a page.

After learning about the DOM and how to manipulate it, you'll build a dynamic application using some sample data. Lastly, you'll learn how to create custom HTML elements to build reusable components using Shadow DOM.