Foreword
Preface
1．Driving Code Through Tests
A Quick Note on Testing Frameworks
Designing for Testability
Testing Fundamentals
Well-Focused Examples
Testing Exceptions
Run the Whole Suite at Once
Advanced Testing Techniques
Using Mocks and Stubs
Testing Complex Output
Keeping Things Organized
Embedding Tests in Library Files
Test Helpers
Custom Assertions
Conclusions
2．Designing Beautiful APIs
Designing for Convenience:Ruport』s Table（ ） feature
Ruby』s Secret Power:Flexible Argument Processing
Standard Ordinal Arguments
Ordinal Arguments with Optional Parameters
Pseudo-Keyword Arguments
Treating Arguments As an Array
Ruby』s Other Secret Power:Code Blocks
Working with Enumerable
Using Blocks to Abstract Pre- and Postprocessing
Blocks As Dynamic Callbacks
Blocks for Interface Simplification
Avoiding Surprises
Use attr_reader, attr_writer, and attr_accessor
Understand What method? and method! Mean
Make Use of Custom Operators
Conclusions
3．Mastering the Dynamic Toolkit
BlankSlate:A BasicObject on Steroids
Building Flexible Interfaces
Making instance_eval（ ） Optional
Handling Messages with method_missing（ ） and send（ ）
Dual-Purpose Accessors
Implementing Per-Object Behavior
Extending and Modifying Preexisting Code
Adding New Functionality
Modification via Aliasing
Per-Object Modification
Building Classes and Modules Programmatically
Registering Hooks and Callbacks
Detecting Newly Added Functionality
Tracking Inheritance
Tracking Mixins
Conclusions
4．Text Processing and File Management
Line-Based File Processing with State Tracking
Regular Expressions
Don』t Work Too Hard
Anchors Are Your Friends
Use Caution When Working with Quantifiers
Working with Files
Using Pathname and FileUtils
The tempfile Standard Library
Automatic Temporary Directory Handling
Collision Avoidance
Same Old I/O Operations
Automatic Unlinking
Text-Processing Strategies
Advanced Line Processing
Atomic Saves
Conclusions
5．Functional Programming Techniques
Laziness Can Be a Virtue （A Look at lazy.rb）
Minimizing Mutable State and Reducing Side Effects
Modular Code Organization
Memoization
Infinite Lists
Higher-Order Procedures
Conclusions
6．When Things Go Wrong
A Process for Debugging Ruby Code
Capturing the Essence of a Defect
Scrutinizing Your Code
Utilizing Reflection
Improving inspect Output
Finding Needles in a Haystack
Working with Logger
Conclusions
7．Reducing Cultural Barriers
m17n by Example:A Look at Ruby』s CSV Standard Library
Portable m17n Through UTF-8 Transcoding
Source Encodings
Working with Files
Transcoding User Input in an Organized Fashion
m17n in Standalone Scripts
Inferring Encodings from Locale
Customizing Encoding Defaults
m17n-Safe Low-Level Text Processing
Localizing Your Code
Conclusions
8．Skillful Project Maintenance
Exploring a Well-Organized Ruby Project （Haml）
Conventions to Know About
What Goes in a README
Laying Out Your Library
Executables
Tests
Examples
API Documentation via RDoc
Basic Documentation Techniques and Guidelines
Controlling Output with RDoc Directives
The RubyGems Package Manager
Writing a Gem::Specification
Working with Dependencies
Rake:Ruby』s Built-in Build Utility
Conclusions
A．Writing Backward-Compatible Code
B．Leveraging Ruby』s Standard Library
C．Ruby Worst Practices
Index
