High Performance JavaScript Build Faster Web Application Interfaces 14341

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

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 Table of Contents

Chapter 1 Loading and Execution

Script Positioning

Grouping Scripts

Nonblocking Scripts

Summary

Chapter 2 Data Access

Managing Scope

Object Members

Summary

Chapter 3 DOM Scripting

DOM in the Browser World

DOM Access and Modification

Repaints and Reflows

Event Delegation

Summary

Chapter 4 Algorithms and Flow Control

Loops

Conditionals

Recursion

Summary

Chapter 5 Strings and Regular Expressions

String Concatenation

Regular Expression Optimization

String Trimming

Summary

Chapter 6 Responsive Interfaces

The Browser UI Thread

Yielding with Timers

Web Workers

Summary

Chapter 7 Ajax

Data Transmission

Data Formats

Ajax Performance Guidelines

Summary

Chapter 8 Programming Practices

Avoid Double Evaluation

Use Object/Array Literals

don't Repeat Work

Use the Fast Parts

Summary

Chapter 9 Building and Deploying High-Performance JavaScript Applications

Apache Ant

Combining JavaScript Files

Preprocessing JavaScript Files

JavaScript Minification

Buildtime Versus Runtime Build Processes

JavaScript Compression

Caching JavaScript Files

Working Around Caching Issues

Using a Content Delivery Network

Deploying JavaScript Resources

Agile JavaScript Build Process

Summary

Chapter 10 Tools

JavaScript Profiling

YUI Profiler

Anonymous Functions

Firebug

Internet Explorer Developer Tools

Safari Web Inspector

Chrome Developer Tools

Script Blocking

Page Speed

Fiddler

YSlow

dynaTrace Ajax Edition

Summary

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