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JAVASCRIPTWEB

JavaScript Cookbook

ISBN: 978-1-491-90188-5

US $49.99 CAN $57.99

“

A comprehensive, example-

driven tour of the language

and its platforms.

”

—Dr. Axel Rauschmayer

author of Speaking JavaScript

Shelley Powers has been working

with and writing about web tech-

nologies—from the first release

of JavaScript to the latest graphics

and design tools—for more than 18

years. Her recent O’Reilly books have

covered JavaScript, HTML5 media

objects, Ajax, and web graphics.

Twitter: @oreillymedia

facebook.com/oreilly

Problem solving with JavaScript is a lot trickier now that its use has expanded

considerably in size, scope, and complexity. This cookbook has your back,

with recipes for common tasks across the JavaScript world, whether you’re

working in the browser, the server, or a mobile environment. Each recipe

includes reusable code and practical advice for tackling JavaScript objects,

Node, Ajax, JSON, data persistence, graphical and media applications, complex

frameworks, modular JavaScript, APIs, and many related technologies.

Aimed at people who have some experience with JavaScript, the first part

covers traditional uses of JavaScript, along with new ideas and improved

functionality. The second part dives into the server, mobile development,

and a plethora of leading-edge tools. You’ll save time—and learn more

about JavaScript in the process.

Topics include:

Classic JavaScript:

■ Arrays, functions, and the JavaScript Object

■ Accessing the user interface

■ Testing and accessibility

■ Creating and using JavaScript libraries

■ Client-server communication with Ajax

■ Rich, interactive web eects

JavaScript, All Blown Up:

■ New ECMAScript standard objects

■ Using Node on the server

■ Modularizing and managing JavaScript

■ Complex JavaScript frameworks

■ Advanced client-server communications

■ Visualizations and client-server graphics

■ Mobile application development

JavaScript Cookbook

SECOND EDITION

Powers

Shelley Powers

JavaScript

Cookbook

PROGRAMMING THE WEB

2nd Edition

www.it-ebooks.info

JAVASCRIPTWEB

JavaScript Cookbook

ISBN: 978-1-491-90188-5

US $49.99 CAN $57.99

“

A comprehensive, example-

driven tour of the language

and its platforms.

”

—Dr. Axel Rauschmayer

author of Speaking JavaScript

Shelley Powers has been working

with and writing about web tech-

nologies—from the first release

of JavaScript to the latest graphics

and design tools—for more than 18

years. Her recent O’Reilly books have

covered JavaScript, HTML5 media

objects, Ajax, and web graphics.

Twitter: @oreillymedia

facebook.com/oreilly

Problem solving with JavaScript is a lot trickier now that its use has expanded

considerably in size, scope, and complexity. This cookbook has your back,

with recipes for common tasks across the JavaScript world, whether you’re

working in the browser, the server, or a mobile environment. Each recipe

includes reusable code and practical advice for tackling JavaScript objects,

Node, Ajax, JSON, data persistence, graphical and media applications, complex

frameworks, modular JavaScript, APIs, and many related technologies.

Aimed at people who have some experience with JavaScript, the first part

covers traditional uses of JavaScript, along with new ideas and improved

functionality. The second part dives into the server, mobile development,

and a plethora of leading-edge tools. You’ll save time—and learn more

about JavaScript in the process.

Topics include:

Classic JavaScript:

■ Arrays, functions, and the JavaScript Object

■ Accessing the user interface

■ Testing and accessibility

■ Creating and using JavaScript libraries

■ Client-server communication with Ajax

■ Rich, interactive web eects

JavaScript, All Blown Up:

■ New ECMAScript standard objects

■ Using Node on the server

■ Modularizing and managing JavaScript

■ Complex JavaScript frameworks

■ Advanced client-server communications

■ Visualizations and client-server graphics

■ Mobile application development

JavaScript Cookbook

SECOND EDITION

Powers

Shelley Powers

JavaScript

Cookbook

PROGRAMMING THE WEB

2nd Edition

www.it-ebooks.info

Table of Contents

The World of JavaScript. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ix

Part I. Classic JavaScript

1.

The JavaScript Not-So-Simple Building Blocks. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

1.1. Differentiating Between a JavaScript Object, Primitive, and Literal 3

1.2. Extracting a List from a String 7

1.3. Checking for an Existing, Nonempty String 10

1.4. Inserting Special Characters 14

1.5. Replacing Patterns with New Strings 16

1.6. Finding and Highlighting All Instances of a Pattern 18

1.7. Swapping Words in a String Using Capturing Parentheses 22

1.8. Replacing HTML Tags with Named Entities 25

1.9. Converting an ISO 8601 Formatted Date to a Date Object Acceptable

Format 25

1.10. Using Function Closures with Timers 29

1.11. Tracking Elapsed Time 31

1.12. Converting a Decimal to a Hexadecimal Value 32

1.13. Summing All Numbers in a Table Column 33

1.14. Converting Between Degrees and Radians 36

1.15. Find the Radius and Center of a Circle to Fit Within a Page Element 37

1.16. Calculating the Length of a Circular Arc 39

1.17. Using ES6 String Extras Without Leaving Users in the Dirt 40

2.

JavaScript Arrays. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

2.1. Searching Through an Array 43

2.2. Flattening a Two-Dimensional Array with concat() and apply() 45

2.3. Removing or Replacing Array Elements 46

2.4. Extracting a Portion of an Array 48

iii

www.it-ebooks.info

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