High Performance JavaScript

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More About This Book

Overview

If you're like most developers, you rely heavily on JavaScript to build interactive and quick-responding web applications. The problem is that all of those lines of JavaScript code can slow down your apps. This book reveals techniques and strategies to help you eliminate performance bottlenecks during development. You'll learn how to improve execution time, downloading, interaction with the DOM, page life cycle, and more.

Yahoo! frontend engineer Nicholas C. Zakas and five other JavaScript experts — Ross Harmes, Julien Lecomte, Steven Levithan, Stoyan Stefanov, and Matt Sweeney — demonstrate optimal ways to load code onto a page, and offer programming tips to help your JavaScript run as efficiently and quickly as possible. You'll learn the best practices to build and deploy your files to a production environment, and tools that can help you find problems once your site goes live.

  • Identify problem code and use faster alternatives to accomplish the same task
  • Improve scripts by learning how JavaScript stores and accesses data
  • Implement JavaScript code so that it doesn't slow down interaction with the DOM
  • Use optimization techniques to improve runtime performance
  • Learn ways to ensure the UI is responsive at all times
  • Achieve faster client-server communication
  • Use a build system to minify files, and HTTP compression to deliver them to the browser

Product Details

  • ISBN-13: 9780596802790
  • Publisher: O'Reilly Media, Incorporated
  • Publication date: 4/15/2010
  • Pages: 242
  • Sales rank: 422,104
  • Product dimensions: 6.90 (w) x 9.10 (h) x 0.50 (d)

Meet the Author

Nicholas C. Zakas is a front-end consultant, author, and speaker. He worked at Yahoo! for almost five years, where he was front-end tech lead for the Yahoo! homepage and a contributor to the YUI library. He is the author of Professional JavaScript for Web Developers (Wrox, 2012), Professional Ajax (Wrox, 2007), and High Performance JavaScript (O’Reilly, 2010). Nicholas is a strong advocate for development best practices including progressive enhancement, accessibility, performance, scalability, and maintainability. He blogs regularly at http://www.nczonline.net/ and can be found on Twitter via @slicknet.

Table of Contents

Preface; The Internet Evolves; Why Optimization Is Necessary; Next-Generation JavaScript Engines; Performance Is Still a Concern; How This Book Is Organized; JavaScript Loading; Coding Technique; Deployment; Testing; Who This Book Is For; Conventions Used in This Book; Using Code Examples; Safari® Books Online; How to Contact Us; Acknowledgments; Chapter 1: Loading and Execution; 1.1 Script Positioning; 1.2 Grouping Scripts; 1.3 Nonblocking Scripts; 1.4 Summary; Chapter 2: Data Access; 2.1 Managing Scope; 2.2 Object Members; 2.3 Summary; Chapter 3: DOM Scripting; 3.1 DOM in the Browser World; 3.2 DOM Access and Modification; 3.3 Repaints and Reflows; 3.4 Event Delegation; 3.5 Summary; Chapter 4: Algorithms and Flow Control; 4.1 Loops; 4.2 Conditionals; 4.3 Recursion; 4.4 Summary; Chapter 5: Strings and Regular Expressions; 5.1 String Concatenation; 5.2 Regular Expression Optimization; 5.3 String Trimming; 5.4 Summary; Chapter 6: Responsive Interfaces; 6.1 The Browser UI Thread; 6.2 Yielding with Timers; 6.3 Web Workers; 6.4 Summary; Chapter 7: Ajax; 7.1 Data Transmission; 7.2 Data Formats; 7.3 Ajax Performance Guidelines; 7.4 Summary; Chapter 8: Programming Practices; 8.1 Avoid Double Evaluation; 8.2 Use Object/Array Literals; 8.3 Don’t Repeat Work; 8.4 Use the Fast Parts; 8.5 Summary; Chapter 9: Building and Deploying High-Performance JavaScript Applications; 9.1 Apache Ant; 9.2 Combining JavaScript Files; 9.3 Preprocessing JavaScript Files; 9.4 JavaScript Minification; 9.5 Buildtime Versus Runtime Build Processes; 9.6 JavaScript Compression; 9.7 Caching JavaScript Files; 9.8 Working Around Caching Issues; 9.9 Using a Content Delivery Network; 9.10 Deploying JavaScript Resources; 9.11 Agile JavaScript Build Process; 9.12 Summary; Chapter 10: Tools; 10.1 JavaScript Profiling; 10.2 YUI Profiler; 10.3 Anonymous Functions; 10.4 Firebug; 10.5 Internet Explorer Developer Tools; 10.6 Safari Web Inspector; 10.7 Chrome Developer Tools; 10.8 Script Blocking; 10.9 Page Speed; 10.10 Fiddler; 10.11 YSlow; 10.12 dynaTrace Ajax Edition; 10.13 Summary; Colophon;

Nicholas C. Zakas is a Web Software Engineer who specializes in user interface design and implementation for Web applications using JavaScript, Dynamic HTML, CSS, XML, and XSLT. He is currently principal front end engineer for the Yahoo! homepage and is a contributor to the Yahoo! User Interface (YUI) library, having written the Cookie Utility, Profiler, and YUI Test.

Nicholas is the author of Professional JavaScript for Web Developers and a co-author on Professional Ajax, and has contributed to other books. He has also written several online articles for WebReference, Sitepoint, and the YUI Blog.

Nicholas regularly gives talks about Web development, JavaScript, and best practices. He has given talks at companies such as Yahoo!, LinkedIn, Google, and NASA, and conferences such as the Ajax Experience, the Rich Web Experience, and Velocity.

Through his writing and speaking, Nicholas seeks to teach others the valuable lessons he's learned while working on some of the most popular and demanding Web applications in the world.

For more information on Nicholas: http://www.nczonline.net/about/

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