High Performance JavaScript. Build Faster Web Application Interfaces (ebook)(audiobook)(audiobook)

Spis treści

• High Performance JavaScript
• Dedication
• Foreword
• 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
• 1. Loading and Execution
  • Script Positioning
  • Grouping Scripts
  • Nonblocking Scripts
    • Deferred Scripts
    • Dynamic Script Elements
    • XMLHttpRequest Script Injection
    • Recommended Nonblocking Pattern
      • The YUI 3 approach
      • The LazyLoad library
      • The LABjs library
  • Summary
• 2. Data Access
  • Managing Scope
    • Scope Chains and Identifier Resolution
    • Identifier Resolution Performance
    • Scope Chain Augmentation
    • Dynamic Scopes
    • Closures, Scope, and Memory
  • Object Members
    • Prototypes
    • Prototype Chains
    • Nested Members
    • Caching Object Member Values
  • Summary
• 3. DOM Scripting
  • DOM in the Browser World
    • Inherently Slow
  • DOM Access and Modification
    • innerHTML Versus DOM methods
    • Cloning Nodes
    • HTML Collections
      • Expensive collections
      • Local variables when accessing collection elements
    • Walking the DOM
      • Crawling the DOM
      • Element nodes
      • The Selectors API
  • Repaints and Reflows
    • When Does a Reflow Happen?
    • Queuing and Flushing Render Tree Changes
    • Minimizing Repaints and Reflows
      • Style changes
      • Batching DOM changes
    • Caching Layout Information
    • Take Elements Out of the Flow for Animations
    • IE and :hover
  • Event Delegation
  • Summary
• 4. Algorithms and Flow Control
  • Loops
    • Types of Loops
    • Loop Performance
      • Decreasing the work per iteration
      • Decreasing the number of iterations
    • Function-Based Iteration
  • Conditionals
    • if-else Versus switch
    • Optimizing if-else
    • Lookup Tables
  • Recursion
    • Call Stack Limits
    • Recursion Patterns
    • Iteration
    • Memoization
  • Summary
• 5. Strings and Regular Expressions
  • String Concatenation
    • Plus (+) and Plus-Equals (+=) Operators
      • Firefox and compile-time folding
    • Array Joining
    • String.prototype.concat
  • Regular Expression Optimization
    • How Regular Expressions Work
    • Understanding Backtracking
      • Alternation and backtracking
      • Repetition and backtracking
    • Runaway Backtracking
      • The solution: Be specific
      • Emulating atomic groups using lookahead and backreferences
      • Nested quantifiers and runaway backtracking
        • From bad to worse
    • A Note on Benchmarking
    • More Ways to Improve Regular Expression Efficiency
    • When Not to Use Regular Expressions
  • String Trimming
    • Trimming with Regular Expressions
    • Trimming Without Regular Expressions
    • A Hybrid Solution
  • Summary
• 6. Responsive Interfaces
  • The Browser UI Thread
    • Browser Limits
    • How Long Is Too Long?
  • Yielding with Timers
    • Timer Basics
    • Timer Precision
    • Array Processing with Timers
    • Splitting Up Tasks
    • Timed Code
    • Timers and Performance
  • Web Workers
    • Worker Environment
    • Worker Communication
    • Loading External Files
    • Practical Uses
  • Summary
• 7. Ajax
  • Data Transmission
    • Requesting Data
      • XMLHttpRequest
        • POST versus GET when using XHR
      • Dynamic script tag insertion
      • Multipart XHR
    • Sending Data
      • XMLHttpRequest
      • Beacons
  • Data Formats
    • XML
      • XPath
      • Response sizes and parse times
    • JSON
      • JSON-P
      • Should you use JSON?
    • HTML
    • Custom Formatting
    • Data Format Conclusions
  • Ajax Performance Guidelines
    • Cache Data
      • Setting HTTP headers
      • Storing data locally
    • Know the Limitations of Your Ajax Library
  • Summary
• 8. Programming Practices
  • Avoid Double Evaluation
  • Use Object/Array Literals
  • Dont Repeat Work
    • Lazy Loading
    • Conditional Advance Loading
  • Use the Fast Parts
    • Bitwise Operators
    • Native Methods
  • Summary
• 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
• 10. Tools
  • JavaScript Profiling
  • YUI Profiler
  • Anonymous Functions
  • Firebug
    • Console Panel Profiler
    • Console API
    • Net Panel
  • Internet Explorer Developer Tools
  • Safari Web Inspector
    • Profiles Panel
    • Resources Panel
  • Chrome Developer Tools
  • Script Blocking
  • Page Speed
  • Fiddler
  • YSlow
  • dynaTrace Ajax Edition
  • Summary
• Index
• About the Author
• Colophon
• Copyright

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