Simplifying JavaScript

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Simplifying JavaScript

Writing Modern JavaScript with ES5, ES6, and Beyond

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The Pragmatic Bookshelf

Raleigh, North Carolina

Simplifying JavaScript

Writing Modern JavaScript with ES5, ES6, and Beyond

Joe Morgan

The Pragmatic Bookshelf

Raleigh, North Carolina

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Copyright ? 2018 The Pragmatic Programmers, LLC.

All rights reserved.

No part of this publication may be reproduced, stored in a retrieval system, or transmitted,

in any form, or by any means, electronic, mechanical, photocopying, recording, or otherwise,

without the prior consent of the publisher.

Printed in the United States of America.

ISBN-13: 978-1-68050-288-6

Encoded using the finest acid-free high-entropy binary digits.

Book version: P1.0¡ªApril 2018

Introduction

Ever get the feeling you¡¯ve woken up and everything¡¯s different? If you¡¯ve

looked at modern JavaScript, you may feel like you woke up in a new world

where nothing¡¯s the same.

Yesterday, you were tweaking a simple jQuery accordion. Today, you look at

some JavaScript code and the ubiquitous jQuery $ operator is gone. In its

place are lots of strange dots (...) and strange symbols (=>) (the spread operator

and arrow functions, as you¡¯ll soon learn). Sure, some things look familiar,

such as class, but even that seems to be unpredictable (where are the private

methods?).

Are you perplexed? Maybe a little excited? Well, I have good news for you:

Everything has changed for the better.

When the ECMAScript 6 spec was released¡ªES6 for short¡ªJavaScript code

changed dramatically. The changes were so substantial that after reading this

book you¡¯ll be able to tell at a glance which code was written with pre-ES6

syntax and which code was written with post-ES6 syntax. JavaScript now is

different. Modern JavaScript is any code composed with post-ES6 syntax.

Modern JavaScript is a pleasure to write. I¡¯m a long-time unrepentant JavaScript fan, but I¡¯ll admit that I found the old syntax a little clunky at times,

and it was pretty hard to defend. Modern JavaScript is better. But it¡¯s changed

significantly, and catching up can be hard.

How To Use This Book

In this book, you¡¯ll learn to write modern JavaScript from the ground up. But

I¡¯m not going to throw a bunch of syntax at you. I want you to learn to think

in terms of contemporary JavaScript. You¡¯ll see every piece of syntax with a

recommendation for not just how to use it, but when to use it.

Also, I¡¯m not going to run through every minor syntax change. I know your

time is valuable, so I¡¯ll only show you syntax that has high impact and that¡¯s

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