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)

3. Node.js APIs and Web Scraping

Learning Objectives

By the end of this chapter, you will be able to:

  • Implement Node.js applications using global objects
  • Create readable and writable Streams
  • Read and write to files using asynchronous and synchronous APIs
  • Create static and dynamic web servers using the http module
  • Download content from websites using the http/https modules
  • Query and extract data from parsed HTML content

In this chapter, we will learn about global objects and functions. Then, we will learn how to write efficient web servers, both static and dynamic, using the http module. Finally, we will use the http and https modules to scrape web pages and extract data from them.