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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. From JavaScript-specific object-oriented programming and inheritance, to combining JavaScript with HTML and other markup languages, expert instruction walks you through the fundamentals and beyond. This new fourth edition has been updated to cover ECMAScript 6 and 7 (also known as ES2015 and ES2016) and the major re-imagination and departure from ES 5.1; new frameworks and libraries, new techniques, new testing tools, and more are explained in detail for the professional developer, with a practical focus that helps you put your new skills to work on real-world projects.
The latest—and most dramatic—ES release is already being incorporated into JavaScript engines in major browsers; this, coupled with the rise in mobile web traffic increasing demand for responsive, dynamic web design, means that all web developers need to update their skills—and this book is your ideal resource for quick, relevant guidance.
Even if you think you know JavaScript, new ES releases bring big changes that will affect the way you work. For a professional-level update that doesn't waste time on coding fundamentals, Professional JavaScript for Web Developers is the ultimate resource to bring you up to speed.
About the author
Matt Frisbie is the author of Angular 2 Cookbook and AngularJS Web Application Development Cookbook as well as several video series. A software engineer at Google, he is actively involved in the JavaScript community and often does open webcasts as well as giving talks at meetups.
Foreword xlvii
Introduction xlix
Chapter 1: What is Javascript? 1
A Short History 2
JavaScript Implementations 3
JavaScript Versions 11
Summary 12
Chapter 2: Javascript in Html 13
The <script> Element 13
Inline Code versus External Files 21
Document Modes 22
The <noscript> Element 23
Summary 24
Chapter 3: Language Basics 25
Syntax 25
Keywords and Reserved Words 28
Variables 29
Data Types 36
Operators 68
Statements 90
Functions 98
Summary 100
Chapter 4: Variables, Scope, and Memory 101
Primitive and Reference Values 101
Execution Context and Scope 106
Garbage Collection 114
Summary 122
Chapter 5: Basic Reference Types 125
The Date Type 126
The RegExp Type 131
Primitive Wrapper Types 139
Singleton Built-in Objects 157
Summary 165
Chapter 6: Collection Reference Types 167
The Object Type 167
The Array Type 170
Typed Arrays 190
The Map Type 201
The WeakMap Type 206
The Set Type 211
The WeakSet Type 217
Iteration and Spread Operators 220
Summary 222
Chapter 7: Iterators and Generators 225
Introduction to Iteration 225
The Iterator Pattern 226
Generators 236
Summary 249
Chapter 8: Objects, Classes, and Object-Oriented Programming 251
Understanding Objects 251
Object Creation 268
Inheritance 289
Classes 302
Summary 320
Chapter 9: Proxies and Reflect 323
Proxy Fundamentals 324
Proxy Traps and Reflect Methods 333
Proxy Patterns 344
Summary 348
Chapter 10: Functions 349
Arrow Functions 350
Function Names 351
Understanding Arguments 353
No Overloading 355
Default Parameter Values 356
Spread Arguments and Rest Parameters 359
Function Declarations versus Function Expressions 361
Functions as Values 362
Function Internals 364
Function Properties and Methods 367
Function Expressions 370
Recursion 372
Tail Call Optimization 373
Closures 376
Immediately Invoked Function Expressions 382
Private Variables 384
Summary 389
Chapter 11: Promises and Async Functions 391
Introduction to Asynchronous Programming 392
Promises 395
Async Functions 421
Summary 435
Chapter 12: The Browser Object Model 437
The window Object 438
The location Object 450
The navigator Object 454
The screen Object 459
The history Object 460
Summary 462
Chapter 13: Client Detection 465
Capability Detection 466
User-Agent Detection 470
Software and Hardware Detection 480
Summary 489
Chapter 14: The Document Object Model 491
Hierarchy of Nodes 492
Working with the DOM 521
Mutation Observers 529
Summary 542
Chapter 15: DOM Extensions 543
Selectors API 544
Element Traversal 546
HTML5 547
Proprietary Extensions 557
Summary 560
Chapter 16: Dom Levels 2 and 3 563
DOM Changes 564
Styles 572
Traversals 584
Ranges 590
Summary 599
Chapter 17: Events 601
Event Flow 602
Event Handlers 604
The Event Object 611
Event Types 619
Memory and Performance 659
Simulating Events 662
Summary 669
Chapter 18: Animation and Graphics with Canvas 671
Using requestAnimationFrame 672
Basic Canvas Usage 676
The 2D Context 677
WebGL 692
Summary 705
Chapter 19: Scripting Forms 707
Form Basics 707
Scripting Text Boxes 715
Scripting Select Boxes 726
Form Serialization 732
Rich Text Editing 734
Summary 741
Chapter 20: Javascript APIs 743
Atomics and SharedArrayBuffer 744
Cross-Context Messaging 751
Encoding API 753
Blob and File APIs 758
Media Elements 764
Native Drag and Drop 770
Notifications API 775
Page Visibility API 776
Streams API 777
Timing APIs 785
Web Components 791
The Web Cryptography API 808
Summary 822
Chapter 21: Error Handling and Debugging 823
Browser Error Reporting 824
Error Handling 825
Debugging Techniques 840
Common Legacy Internet Explorer Errors 844
Summary 846
Chapter 22: XML in Javascript 849
XML DOM Support in Browsers 849
XPath Support in Browsers 852
XSLT Support in Browsers 857
Summary 859
Chapter 23: JSON 861
Syntax 862
Parsing and Serialization 864
Summary 870
Chapter 24: Network Requests and Remote Resources 871
The XMLHttpRequest Object 872
XMLHttpRequest Level 2 878
Progress Events 880
Cross-Origin Resource Sharing 881
Alternate Cross-Domain Techniques 884
The Fetch API 885
The Beacon API 914
Web Sockets 915
Security 917
Summary 918
Chapter 25: Client-Side Storage 919
Cookies 919
Web Storage 929
IndexedDB 933
Summary 944
Chapter 26: Modules 945
Understanding the module pattern 946
Improvising Module Systems 950
Working with pre-ES6 module loaders 953
Working with ES6 modules 958
Summary 967
Chapter 27: Workers 969
Introduction to Workers 970
Dedicated Workers 973
Shared Workers 997
Service Workers 1003
Summary 1033
Chapter 28: Best Practices 1035
Maintainability 1035
Performance 1047
Deployment 1059
Summary 1064
Appendix A: ES2018 and ES2019 1067
Appendix B: Strict Mode 1087
Appendix C: Javascript Libraries and Frameworks 1095
Appendix D: Javascript Tools 1101
Index 1113
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