Book Image

Advanced JavaScript

By : Zachary Shute
Book Image

Advanced JavaScript

By: Zachary Shute

Overview of this book

If you are looking for a programming language to develop flexible and efficient applications, JavaScript is an obvious choice. Advanced JavaScript is a hands-on guide that takes you through JavaScript and its many features, one step at a time. You'll begin by learning how to use the new JavaScript syntax in ES6, and then work through the many other features that modern JavaScript has to offer. As you progress through the chapters, you’ll use asynchronous programming with callbacks and promises, handle browser events, and perform Document Object Model (DOM) manipulation. You'll also explore various methods of testing JavaScript projects. In the concluding chapters, you'll discover functional programming and learn to use it to build your apps. With this book as your guide, you'll also be able to develop APIs using Node.js and Express, create front-ends using React/Redux, and build mobile apps using React/Expo. By the end of Advanced JavaScript, you will have explored the features and benefits of JavaScript to build small applications.

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Table of Contents (9 chapters)
Advanced JavaScript
Advanced JavaScript
Preface
Preface
Free Chapter
1
Introducing ECMAScript 6
Introducing ECMAScript 6
Introduction
Beginning with ECMAScript
Understanding Scope
Declaring Variables
Introducing Arrow Functions
Learning Template Literals
Enhanced Object Properties
Destructuring Assignment
Classes and Modules
Transpilation
Iterators and Generators
Summary
2
Asynchronous JavaScript
Asynchronous JavaScript
Introduction
Asynchronous Programming
Callbacks
Promises
Async/Await
Summary
3
DOM Manipulation and Event Handling
DOM Manipulation and Event Handling
Introduction
DOM Chaining, Navigation, and Manipulation
DOM Events and Event Objects
JQuery
Summary
4
Testing JavaScript
Testing JavaScript
Introduction
Testing
Types of Testing
Test Tools and Environments
Summary
5
Functional Programming
Functional Programming
Introduction
Introducing Functional Programming
Declarative Versus Imperative
Pure Functions
Higher Order Functions
Shared State
Immutability
Side Effects
Function Composition
Summary
6
The JavaScript Ecosystem
The JavaScript Ecosystem
Introduction
JavaScript Ecosystem
Node.js
React
Summary
Appendix
Appendix
Chapter 1: Introducing ECMAScript 6
Chapter 2: Asynchronous JavaScript
Chapter 3: DOM Manipulation and Event Handling
Chapter 4: Testing JavaScript
Chapter 5: Functional Programming
Chapter 6: JavaScript Ecosystem

Declarative Versus Imperative

There are two general ways to think about writing code: Declarative and Imperative. Code written in the Functional Programming paradigm should be declarative.

Declarative code is code that expresses the logic of a computation without describing its control flow. Imperative code is code that uses statements to change a program's state.

These definitions are difficult to understand if you have never studied declarative and imperative code before. Declarative code is generally used with Functional Programming and imperative code is generally used with Object-Oriented Programming. There is no "right answer" when deciding which coding style to use; they both have their trade-offs. However, declarative code fits the Functional Programming paradigm better than imperative.

Imperative Functions

Imperative code is most common in OOP. The technical definition is complicated, but we can simplify it. An imperative approach to coding is about HOW you solve the problem. Consider...

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