Professional JavaScript for Web Developers is the essential guide to next-level JavaScript development. Written for intermediate-to-advanced programmers, this book jumps right into the technical details to help you clean up your code and become a more sophisticated JavaScript developer.

Professional JavaScript for Web Developers, 4th Edition

JavaScript makes your pages dance, move and interact. For a front-end developer, it’s a fundamental skill.

JavaScript

PROFESSIONAL JavaScript ® for Web Developers

Preface

What Is JavaScript?

JavaScript in HTML

Language Basics

Variables, Scope, and Memory

Basic Reference Types

Collection Reference Types

Iterators and Generators

Objects, Classes, and Object-Oriented Programming

Proxies and Reflect

Functions

Promises and Async Functions

The Browser Object Model

Client Detection

The Document Object Model

DOM Extensions

DOM Levels 2 and 3

Events

Animation and Graphics with Canvas

Scripting Forms

JavaScript APIs

Error Handling and Debugging

XML in JavaScript

JSON

Network Requests and Remote Resources

Client-Side Storage

Modules

Workers

Best Practices

Beginning with ECMAScript 2015, the TC-39 committee moved to begin releasing a new ECMA specification each year. Doing so allows them to collect all individual proposals that are at a sufficiently advanced stage and package them as a single bundle. This packaging is of limited importance, however, as browser vendors tend to adopt proposals in a piecemeal fashion. When a proposal has reached stage 4, its behavior will not change, it is likely to be included in the next ECMAScript release, and browsers will begin adopting the proposal's features at their discretion.

ES2018 and ES2019

ECMAScript 5 was the first to introduce the concept of strict mode . Strict mode allows you to opt-in to stricter checking for JavaScript error conditions either globally or locally within a single function. The advantage of strict mode is that you'll be informed of errors earlier, so some of the ECMAScript quirks that cause programming errors will be caught immediately.

Strict Mode

JavaScript libraries help to bridge the gap between browser differences and provide easier access to complex browser features. Libraries come in two forms: general and specialty . General JavaScript libraries provide access to common browser functionality and can be used as the basis for a website or web application. Specialty libraries do only specific things and are intended to be used for only parts of a website or web application. This appendix provides an overview of these libraries and some of their functionality, along with websites that you can use as additional resources.

JavaScript Libraries and Frameworks

Writing JavaScript is a lot like writing in any other programming language, with tools designed to make development easier. The number of tools available for JavaScript developers continues to grow, making it much easier to locate problems, optimize, and deploy JavaScript-based solutions. Some of the tools are designed to be used from JavaScript, whereas others can be run outside the browser. This appendix provides an overview of some of these tools, as well as additional resources for more information.

JavaScript Tools

Symbols + (add) operator, 83–84 & (AND) operator (bitwise), 74 && (AND) operator (logical), 78–79 * (asterisk), 26 ` (backticks), 46, 47 {} (curly braces), 27–28, 111 $ (dollar sign), 26 / (divide) operator, 81 ** (exponentiation operator), 82 == (equal) operator, 86–87, 833–835 / (forward slash), 26 > (greater-than) operator, 85–86 >= (greater-than-or-equal-to) operator, 85–86 === (identically equal to) operator, 87–88 << (left shift), 76 < (less-than) operator, 19, 85–86 <= (less-than-or-equal-to) operator, 85–86 -- (minus signs), 69 & (modulus) operator, 82 * (multiply) operator, 80–81 ! (NOT) operator, 73–74, 77–78 != (not-equal) operator, 86–87, 833–835 !== (not identically equal to) operator, 88 | (OR) operator (bitwise), 74–75 || (OR) operator (logical), 79–80 ++ (plus signs), 68 >> (signed right shift), 76 + (single plus sign), 70–72 - (subtract) operator, 84–85 _ (underscore), 26 >>> (unsigned right shift), 76–77 ^ (XOR) operator, 75 

Professional JavaScript for Web Developers, 4th Edition

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Matt Frisbie

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Professional JavaScript for Web Developers, 4th Edition