coll. - JavaScript: Best Practice
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Copyright 2018 SitePoint Pty. Ltd.
- Cover Design: Alex Walker
All rights reserved. No part of this book may be reproduced, stored in a retrieval system or transmitted in any form or by any means, without the prior written permission of the publisher, except in the case of brief quotations embodied in critical articles or reviews.
The author and publisher have made every effort to ensure the accuracy of the information herein. However, the information contained in this book is sold without warranty, either express or implied. Neither the authors and SitePoint Pty. Ltd., nor its dealers or distributors will be held liable for any damages to be caused either directly or indirectly by the instructions contained in this book, or by the software or hardware products described herein.
Rather than indicating every occurrence of a trademarked name as such, this book uses the names only in an editorial fashion and to the benefit of the trademark owner with no intention of infringement of the trademark.
Published by SitePoint Pty. Ltd.
48 Cambridge Street Collingwood
VIC Australia 3066
Web: www.sitepoint.com
Email: books@sitepoint.com
SitePoint specializes in publishing fun, practical, and easy-to-understand content for web professionals. Visit http://www.sitepoint.com/ to access our blogs, books, newsletters, articles, and community forums. Youll find a stack of information on JavaScript, PHP, design, and more.
Theres no doubt that the JavaScript ecosystem changes fast. Not only are new tools and frameworks introduced and developed at a rapid rate, the language itself has undergone big changes with the introduction of ES2015 (aka ES6). Understandably, many articles have been written complaining about how difficult it is to learn modern JavaScript development these days. We're aiming to minimize that confusion with this set of books on modern JavaScript.
This book presents modern JavaScript best practice, utilizing the features now available in the language, enabling you to write more powerful code that is clean, performant, maintainable, and resusable.
This book is for all front-end developers who wish to improve their JavaScript skills. Youll need to be familiar with HTML and CSS and have a reasonable level of understanding of JavaScript in order to follow the discussion.
Code in this book is displayed using a fixed-width font, like so:
A Perfect Summer's DayIt was a lovely day for a walk in the park.The birds were singing and the kids were all back at school.
Where existing code is required for context, rather than repeat all of it, will be displayed:
function animate() { new_variable = "Hello";}Some lines of code should be entered on one line, but weve had to wrap them because of page constraints. An indicates a line break that exists for formatting purposes only, and should be ignored:
URL.open("http://www.sitepoint.com/responsive-web-design-real-user-testing/?responsive1");Youll notice that weve used certain layout styles throughout this book to signify different types of information. Look out for the following items.
Tips provide helpful little pointers.
Notes are useful asides that are relatedbut not criticalto the topic at hand. Think of them as extra tidbits of information.
... pay attention to these important points.
Warnings highlight any gotchas that are likely to trip you up along the way.
Theres no doubt that the JavaScript ecosystem changes fast. Not only are new tools and frameworks introduced and developed at a rapid rate, the language itself has undergone big changes with the introduction of ES2015 (aka ES6). Understandably, many articles have been written complaining about how difficult it is to learn modern JavaScript development these days.
In this article, Ill introduce you to modern JavaScript. Well take a look at recent developments in the language and get an overview of the tools and techniques currently used to write front-end web applications. If youre just starting out with learning the language, or youve not touched it for a few years and are wondering what happened to the JavaScript you used to know, this article is for you.
Node.js is a runtime that allows server-side programs to be written in JavaScript. Its possible to have full-stack JavaScript applications, where both the front and back end of the app is written in the same language. Although this article is focused on client-side development, Node.js still plays an important role.
The arrival of Node.js had a significant impact on the JavaScript ecosystem, introducing the npm package manager and popularizing the CommonJS module format. Developers started to build more innovative tools and develop new approaches to blur the line between the browser, the server, and native applications.
In 2015, the sixth version of ECMAScript the specification that defines the JavaScript language was released under the name of ES2015 (still often referred to as ES6). This new version included substantial additions to the language, making it easier and more feasible to build ambitious web applications. But improvements dont stop with ES2015; each year, a new version is released.
JavaScript now has two additional ways to declare variables: let and const.
let is the successor to var. Although var is still available, let limits the scope of variables to the block (rather than the function) theyre declared within, which reduces the room for error:
// ES5for (var i = 1; i < 5; i++) { console.log(i);}// <-- logs the numbers 1 to 4console.log(i);// <-- 5 (variable i still exists outside the loop)// ES2015for (let j = 1; j < 5; j++) { console.log(j);}console.log(j);// <-- 'Uncaught ReferenceError: j is not defined'Using const allows you to define variables that cannot be rebound to new values. For primitive values such as strings and numbers, this results in something similar to a constant, as you cannot change the value once it has been declared:
const name = 'Bill';name = 'Steve';// <-- 'Uncaught TypeError: Assignment to constant variable.'// Gotchaconst person = { name: 'Bill' };person.name = 'Steve';// person.name is now Steve.// As we're not changing the object that person is bound to, JavaScript doesn't complain.Arrow functions provide a cleaner syntax for declaring anonymous functions (lambdas), dropping the function keyword and the return keyword when the body function only has one expression. This can allow you to write functional style code in a nicer way:
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