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Learn ECMAScript - Second Edition

By : MOHAN, Narayan Prusty

4 (1)

Buy this Book

Learn ECMAScript

4 (1)

By: MOHAN, Narayan Prusty

Buy this Book

Overview of this book

Learn ECMAScript explores implementation of the latest ECMAScript features to add to your developer toolbox, helping you to progress to an advanced level. Learn to add 1 to a variable andsafely access shared memory data within multiple threads to avoid race conditions. You’ll start the book by building on your existing knowledge of JavaScript, covering performing arithmetic operations, using arrow functions and dealing with closures. Next, you will grasp the most commonly used ECMAScript skills such as reflection, proxies, and classes. Furthermore, you’ll learn modularizing the JS code base, implementing JS on the web and how the modern HTML5 + JS APIs provide power to developers on the web. Finally, you will learn the deeper parts of the language, which include making JavaScript multithreaded with dedicated and shared web workers, memory management, shared memory, and atomics. It doesn’t end here; this book is 100% compatible with ES.Next. By the end of this book, you'll have fully mastered all the features of ECMAScript!

Preface

Who this book is for

What this book covers

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Free Chapter

Getting Started with ECMAScript

The let keyword

The const keyword

Immutability in JavaScript

Default parameter values

The spread operator

The rest parameter

Hoisting

Destructuring assignments

Arrow functions

Enhanced object literals

Trailing commas and JavaScript

The semicolon dilemma

Summary

Knowing Your Library

Working with numbers

Doing math

Arrays

Collections

Objects

Summary

Using Iterators

Symbols – primitive data type

The iteration protocol

Generator function

Tail call optimization

Summary

Asynchronous Programming

JavaScript execution model

The event loop

Writing asynchronous code

Promises and async programming

async/await – the future of asynchronous programming

Summary

Modular Programming

JavaScript modules 101

Implementing modules – the old way

Implementing modules – the new way

Tree shaking

Using modules on the web

Summary

Implementing the Reflect API

The Reflect object

Summary

Proxies

Proxies in a nutshell

Working with the Proxy API

The uses of proxies

Summary

Classes

Understanding object-oriented JavaScript

Using classes

Using super in object literals

Summary

JavaScript on the Web

HTML5 and the rise of modern JavaScript

Modern JavaScript browser APIs

Summary

Storage APIs in JavaScript

HyperText Transfer Protocol (HTTP)

Storing data with cookies

Working with localStorage

Working with SessionStorage

Handling storage changes across multiple tabs

Cookies versus local storage

The indexedDB - storing large data

Summary

Web and Service Workers

An introduction to the concept of threads

Introduction to web workers

Checking if worker support is available

Working with dedicated web workers

Working with shared workers

Introduction to inline web workers

Same origin policy

Working with service workers

Summary

Shared Memory and Atomics

Basics of memory

What is shared memory?

Understanding parallel programming

What are atomics?

Fixing one billion count with atomics

A peek into Spectre

Summary

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Modular Programming

Modular programming is one of the most important and frequently used software design techniques. Modular programming basically means splitting your code into multiple files that are usually independent of each other. This makes it a cake-walk when managing and maintaining different modules of a program. It helps in debugging nasty bugs easily, pushing updates to a particular module, and so on.

Unfortunately, for a long time, JavaScript didn't support modules natively; that led programmers to use alternative techniques to achieve modular programming in JavaScript. However, ES6 introduced a native modular technique in JavaScript for the first time.

This chapter is all about how to create and import JavaScript modules. In this chapter, we will first learn how modules were created earlier, and then we will jump to the new built-in JavaScript module system...