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

First-class functions are part and parcel of using a popular library such as React and its patterns. They also power any and every delegation of implementation, especially on built-ins such as Array. Another core tenet of functional programming is pure functions. Using pure functions for complex data manipulation logic or an abstraction layer around a data structure is a great pattern that was put forward by the popular Redux state management solution. Any side effects and/or dependencies that must be mocked make it that much harder to reason about a complex data manipulation. Higher-order functions and specific techniques such as currying and partial application are widespread in day-to-day JavaScript development. Currying and partial application is a way to design functions with an interface that makes each step of specialization "savable" since it is already a function that has already been applied with a certain number of parameters.

The composition can have...