Ruby Cookbook 2nd Edition by Lucas Carlson,Richardson Leonard 9781449373719 1449373712

Chapter 1. Ruby 2.1

1.1 What’s Different Between Ruby 1.8 and 2.1?

Problem

Solution

1.2 YARV (Yet Another Ruby VM) Bytecode Interpreter

Problem

Solution

Discussion

See Also

1.3 Syntax Changes

Problem

Solution

See Also

1.4 Keyword Arguments

Problem

Solution

Discussion

1.5 Performance Enhancements

Problem

Solution

See Also

1.6 Refinements

Problem

Solution

Discussion

1.7 Debugging with DTrace and TracePoint

Problem

Solution

Discussion

See Also

1.8 Module Prepending

Problem

Solution

Discussion

See Also

1.9 New Methods

Problem

Solution

See Also

1.10 New Classes

Problem

Solution

See Also

1.11 New Standard Libraries

Problem

Solution

See Also

1.12 What’s Next?

Problem

Solution

See Also

Chapter 2. Strings

2.1 Building a String from Parts

Problem

Solution

Discussion

2.2 Substituting Variables into Strings

Problem

Solution

Discussion

See Also

2.3 Substituting Variables into an Existing String

Problem

Solution

Discussion

See Also

2.4 Reversing a String by Words or Characters

Problem

Solution

Discussion

See Also

2.5 Representing Unprintable Characters

Problem

Solution

Discussion

2.6 Converting Between Characters and Values

Problem

Solution

Discussion

See Also

2.7 Converting Between Strings and Symbols

Problem

Solution

Discussion

See Also

2.8 Processing a String One Character at a Time

Problem

Solution

Discussion

See Also

2.9 Processing a String One Word at a Time

Problem

Solution

Discussion

See Also

2.10 Changing the Case of a String

Problem

Solution

Discussion

See Also

2.11 Managing Whitespace

Problem

Solution

Discussion

2.12 Testing Whether an Object Is String-Like

Problem

Solution

Discussion

See Also

2.13 Getting the Parts of a String You Want

Problem

Solution

Discussion

See Also

2.14 Word-Wrapping Lines of Text

Problem

Solution

Discussion

See Also

2.15 Generating a Succession of Strings

Problem

Solution

Discussion

See Also

2.16 Matching Strings with Regular Expressions

Problem

Solution

Discussion

See Also

2.17 Replacing Multiple Patterns in a Single Pass

Problem

Solution

Discussion

See Also

2.18 Validating an Email Address

Problem

Solution

Discussion

See Also

2.19 Classifying Text with a Bayesian Analyzer

Problem

Solution

Discussion

See Also

Chapter 3. Numbers

3.1 Parsing a Number from a String

Problem

Solution

Discussion

See Also

3.2 Comparing Floating-Point Numbers

Problem

Solution

Discussion

See Also

3.3 Representing Numbers to Arbitrary Precision

Problem

Solution

Discussion

See Also

3.4 Representing Rational Numbers

Problem

Solution

Discussion

See Also

3.5 Generating Random Numbers

Problem

Solution

Discussion

See Also

3.6 Converting Between Numeric Bases

Problem

Solution

Discussion

See Also

3.7 Taking Logarithms

Problem

Solution

Discussion

See Also

3.8 Finding Mean, Median, and Mode

Problem

Solution

Discussion

See Also

3.9 Converting Between Degrees and Radians

Problem

Solution

Discussion

See Also

3.10 Multiplying Matrices

Problem

Solution

Discussion

See Also

3.11 Solving a System of Linear Equations

Problem

Solution

Discussion

See Also

3.12 Using Complex Numbers

Problem

Solution

Discussion

See Also

3.13 Simulating a Subclass of Fixnum

Problem

Solution

Discussion

See Also

3.14 Doing Math with Roman Numbers

Problem

Solution

Discussion

See Also

3.15 Generating a Sequence of Numbers

Problem

Solution

Discussion

See Also

3.16 Generating Prime Numbers

Problem

Solution

Discussion

See Also

3.17 Checking a Credit Card Checksum

Problem

Solution

Discussion

See Also

Chapter 4. Date and Time

4.1 Finding Today’s Date

Problem

Solution

Discussion

See Also

4.2 Parsing Dates, Precisely or Fuzzily

Problem

Solution

Discussion

See Also

4.3 Printing a Date

Problem

Solution

Discussion

See Also

4.4 Iterating Over Dates

Problem

Solution

Discussion

See Also

4.5 Doing Date Arithmetic

Problem

Solution

Discussion

See Also

4.6 Counting the Days Since an Arbitrary Date

Problem

Solution

Discussion

See Also

4.7 Converting Between Time Zones

Problem

Solution

Discussion

See Also

4.8 Checking Whether Daylight Saving Time Is in Effect

Problem

Solution

Discussion

See Also

4.9 Converting Between Time and DateTime Objects

Problem

Solution

Discussion

See Also

4.10 Finding the Day of the Week

Problem

Solution

Discussion

See Also

4.11 Handling Commercial Dates

Problem

Solution

Discussion

See Also

4.12 Running a Code Block Periodically

Problem

Solution

Discussion

See Also

4.13 Waiting a Certain Amount of Time

Problem

Solution

Discussion

See Also

4.14 Adding a Timeout to a Long-Running Operation

Problem

Solution

Discussion

See Also

Chapter 5. Arrays

5.1 Iterating Over an Array

Problem

Solution

Discussion

See Also

5.2 Rearranging Values Without Using Temporary Variables

Problem

Solution

Discussion

5.3 Stripping Duplicate Elements from an Array

Problem

Solution

Discussion

5.4 Reversing an Array

Problem

Solution

Discussion

See Also

5.5 Sorting an Array

Problem

Solution

Discussion

See Also

5.6 Ignoring Case When Sorting Strings

Problem

Solution

Discussion

See Also

5.7 Making Sure a Sorted Array Stays Sorted

Problem

Solution

Discussion

See Also

5.8 Summing the Items of an Array

Problem

Solution

Discussion

See Also

5.9 Sorting an Array by Frequency of Appearance

Problem

Solution

Discussion

See Also

5.10 Shuffling an Array

Problem

Solution

Discussion

See Also

5.11 Getting the N Smallest Items of an Array

Problem

Solution

Discussion

See Also

5.12 Building a Hash from an Array

Problem

Solution

Discussion

References

5.13 Extracting Portions of Arrays

Problem

Solution

Discussion

See Also

5.14 Computing Set Operations on Arrays

Problem

Solution

Discussion

See Also

5.15 Partitioning or Classifying a Set

Problem

Solution

Discussion

Chapter 6. Hashes

6.1 Using Symbols as Hash Keys

Problem

Solution

Discussion

See Also

6.2 Creating a Hash with a Default Value

Problem

Solution

Discussion

See Also

6.3 Adding Elements to a Hash

Problem

Solution

Discussion

See Also

6.4 Removing Elements from a Hash

Problem

Solution

Discussion

See Also

6.5 Using an Array or Other Modifiable Object as a Hash Key

Problem

Solution

Discussion

See Also

6.6 Keeping Multiple Values for the Same Hash Key

Problem

Solution

Discussion

See Also

6.7 Iterating Over a Hash

Problem

Solution

Discussion

See Also

6.8 Iterating Over a Hash in Insertion Order

Problem

Solution

Discussion

See Also

6.9 Printing a Hash

Problem

Solution

Discussion

See Also

6.10 Inverting a Hash

Problem

Solution

Discussion

See Also

6.11 Choosing Randomly from a Weighted List

Problem

Solution

Discussion

See Also

6.12 Building a Histogram

Problem

Solution

Discussion

See Also

6.13 Remapping the Keys and Values of a Hash

Problem

Solution

Discussion

See Also

6.14 Extracting Portions of Hashes

Problem

Solution

Discussion

See Also

6.15 Searching a Hash with Regular Expressions

Problem

Solution

Discussion

Chapter 7. Files and Directories

7.1 Checking to See If a File Exists

Problem

Solution

Discussion

See Also

7.2 Checking Your Access to a File

Problem

Solution

Discussion

setuid and setgid Scripts

See Also

7.3 Changing the Permissions on a File

Problem

Solution

Discussion

See Also

7.4 Seeing When a File Was Last Used

Problem

Solution

Discussion

See Also

7.5 Listing a Directory

Problem

Solution

Discussion

See Also

7.6 Reading the Contents of a File

Problem

Solution

Discussion

See Also

7.7 Writing to a File

Problem

Solution

Discussion

Buffered I/O

See Also

7.8 Writing to a Temporary File

Problem

Solution

Discussion

7.9 Picking a Random Line from a File

Problem

Solution

Discussion

See Also

7.10 Comparing Two Files

Problem

Solution

Discussion

See Also

7.11 Performing Random Access on “Read-Once” Input Streams

Problem

Solution

Discussion

See Also

7.12 Walking a Directory Tree

Problem

Solution

Discussion

See Also

7.13 Locking a File

Problem

Solution

Discussion

Nonblocking Locks

See Also

7.14 Backing Up to Versioned Filenames

Problem

Solution

Discussion

See Also

7.15 Pretending a String Is a File

Problem

Solution

Discussion

See Also

7.16 Redirecting Standard Input or Output

Problem

Solution

Discussion

See Also

7.17 Processing a Binary File

Problem

Solution

Discussion

An MP3 Example

See Also

7.18 Deleting a File

Problem

Solution

Discussion

7.19 Truncating a File

Problem

Solution

Discussion

7.20 Finding the Files You Want

Problem

Solution

Discussion

See Also

7.21 Finding and Changing the Current Working Directory

Problem

Solution

Discussion

See Also

Chapter 8. Code Blocks and Iteration

8.1 Creating and Invoking a Block

Problem

Solution

Discussion

See Also

8.2 Writing a Method That Accepts a Block

Problem

Solution

Discussion

See Also

8.3 Binding a Block Argument to a Variable

Problem

Solution

Discussion

See Also

8.4 Blocks as Closures: Using Outside Variables Within a Code Block

Problem

Solution

Discussion

8.5 Writing an Iterator Over a Data Structure

Problem

Solution

Discussion

See Also

8.6 Changing the Way an Object Iterates

Problem

Discussion

Discussion

See Also

8.7 Writing Block Methods That Classify or Collect

Problem

Solution

Discussion

See Also

8.8 Stopping an Iteration

Problem

Solution

Discussion

See Also

8.9 Looping Through Multiple Iterables in Parallel

Problem

Solution

Discussion

See Also

8.10 Hiding Setup and Cleanup in a Block Method

Problem

Solution

Discussion

See Also

8.11 Coupling Systems Loosely with Callbacks

Problem

Solution

Discussion

Chapter 9. Objects and Classes

9.1 Managing Instance Data

Problem

Solution

Discussion

See Also

9.2 Managing Class Data

Problem

Solution

Discussion

See Also

9.3 Checking Class or Module Membership

Problem

Solution

Discussion

See Also

9.4 Writing an Inherited Class

Problem

Solution

Discussion

See Also

9.5 Overloading Methods

Problem

Solution

Discussion

See Also

9.6 Validating and Modifying Attribute Values

Problem

Solution

Discussion

See Also

9.7 Defining a Virtual Attribute

Problem

Solution

Discussion

See Also

9.8 Delegating Method Calls to Another Object

Problem

Solution

Discussion

See Also

9.9 Converting and Coercing Objects to Different Types

Problem

Solution

Discussion

See Also

9.10 Getting a Human-Readable Printout of Any Object

Problem

Solution

Discussion

9.11 Accepting or Passing a Variable Number of Arguments

Problem

Solution

Discussion

9.12 Using Keyword Arguments

Problem

Solution

Discussion

See Also

9.13 Calling a Superclass’s Method

Problem

Solution

Discussion

9.14 Creating an Abstract Method

Problem

Solution

Discussion

9.15 Freezing an Object to Prevent Changes

Problem

Solution

Discussion

See Also

9.16 Making a Copy of an Object

Problem

Solution

Discussion

See Also

9.17 Declaring Constants

Problem

Solution

Discussion

See Also

9.18 Implementing Class and Singleton Methods

Problem

Solution

Discussion

9.19 Controlling Access by Making Methods Private

Problem

Solution

Discussion

See Also

Chapter 10. Modules and Namespaces

10.1 Simulating Multiple Inheritance with Mixins

Problem

Solution

Discussion

See Also

10.2 Extending Specific Objects with Modules

Problem

Solution

Discussion

See Also

10.3 Mixing in Class Methods

Problem

Solution

Discussion

See Also

10.4 Implementing Enumerable: Write One Method, Get 48 Free

Problem

Solution

Discussion

See Also

10.5 Avoiding Naming Collisions with Namespaces

Problem

Solution

Discussion

See Also

10.6 Automatically Loading Libraries as Needed

Problem

Solution

Discussion

10.7 Including Namespaces

Problem

Solution

Discussion

See Also

10.8 Initializing Instance Variables Defined by a Module

Problem

Solution

Discussion

See Also

10.9 Automatically Initializing Mixed-in Modules

Problem

Solution

Discussion

See Also

10.10 Prepending Modules

Problem

Solution

Discussion

Chapter 11. Reflection and Metaprogramming

11.1 Finding an Object’s Class and Superclass

Problem

Solution

Discussion

See Also

11.2 Listing an Object’s Methods

Problem

Solution

Discussion

See Also

11.3 Listing Methods Unique to an Object

Problem

Solution

Discussion

See Also

11.4 Getting a Reference to a Method

Problem

Solution

Discussion

See Also

11.5 Fixing Bugs in Someone Else’s Class

Problem

Solutions

Discussion

See Also

11.6 Listening for Changes to a Class

Problem

Solution

Discussion

See Also

11.7 Checking Whether an Object Has Necessary Attributes

Problem

Solution

Discussion

See Also

11.8 Responding to Calls to Undefined Methods

Problem

Solution

Discussion

See Also

11.9 Automatically Initializing Instance Variables

Problem

Solution

Discussion

11.10 Avoiding Boilerplate Code with Metaprogramming

Problem

Solution

Discussion

See Also

11.11 Metaprogramming with String Evaluations

Problem

Solution

Discussion

11.12 Evaluating Code in an Earlier Context

Problem

Solution

Discussion

See Also

11.13 Undefining a Method

Problem

Solution

Discussion

See Also

11.14 Aliasing Methods

Problem

Solution

Discussion

See Also

11.15 Doing Aspect-Oriented Programming

Problem

Solution

Discussion

See Also

11.16 Enforcing Software Contracts

Problem

Solution

Discussion

See Also

Chapter 12. XML and HTML

12.1 Checking That XML Is Well Formed

Problem

Solution

Discussion

See Also

12.2 Extracting Data from a Document’s Tree Structure

Problem

Solution

Discussion

See Also

12.3 Extracting Data While Parsing a Document

Problem

Solution

Discussion

See Also

12.4 Navigating a Document with XPath

Problem

Solution

Discussion

See Also

12.5 Converting an XML Document into a Hash

Problem

Solution

Discussion

See Also

12.6 Validating an XML Document

Problem

Solution

Discussion

See Also

12.7 Substituting XML Entities

Problem

Solution

Discussion

See Also

12.8 Creating and Modifying XML Documents

Problem

Solution

Discussion

See Also

12.9 Compressing Whitespace in an XML Document

Problem

Solution

Discussion

See Also

12.10 Guessing a Document’s Encoding

Problem

Solution

Discussion

See Also

12.11 Converting from One Encoding to Another

Problem

Solution

Discussion

See Also

12.12 Extracting All the URLs from an HTML Document

Problem

Solution

Discussion

See Also

12.13 Transforming Plain Text to HTML

Problem

Solution

Discussion

See Also

12.14 Converting HTML Documents from the Web into Text

Problem

Solution

Discussion

See Also

12.15 Creating a Simple Feed Aggregator

Problem

Solution

See Also

Chapter 13. Graphics and Other File Formats

13.1 Thumbnailing Images

Problem

Solution

Discussion

See Also

13.2 Adding Text to an Image

Problem

Solution

Discussion

See Also

13.3 Converting One Image Format to Another

Problem

Solution

Discussion

See Also

13.4 Graphing Data

Problem

Solution

Discussion

See Also

13.5 Adding Graphical Context with Sparklines

Problem

Solution

Discussion

See Also

13.6 Symmetrically Encrypting Data

Problem

Solution

Discussion

See Also

13.7 Parsing Comma-Separated Data

Problem

Solution

Discussion

See Also

13.8 Parsing Not-Quite-Comma-Separated Data

Problem

Solution

Discussion

See Also

13.9 Generating and Parsing Excel Spreadsheets

Problem

Solution

Discussion

See Also

13.10 Compressing and Archiving Files with Gzip and Tar

Problem

Solution

Discussion

See Also

13.11 Reading and Writing ZIP Files

Problem

Solution

Discussion

See Also

13.12 Reading and Writing Configuration Files

Problem

Solution

Discussion

See Also

13.13 Generating PDF Files

Problem

Solution

Discussion

See Also

13.14 Representing Data as MIDI Music

Problem

Solution

Discussion

See Also

Chapter 14. Databases and Persistence

14.1 Serializing Data with YAML

Problem

Solution

Discussion

See Also

14.2 Serializing Data with Marshal

Problem

Solution

Discussion

See Also

14.3 Persisting Objects with Madeleine

Problem

Solution

Discussion

See Also

14.4 Indexing Unstructured Text with SimpleSearch

Problem

Solution

Discussion

See Also

14.5 Indexing Structured Text with Ferret

Problem

Discussion

Discussion

See Also

14.6 Using Berkeley DB Databases

Problem

Solution

Discussion

See Also

14.7 Controlling MySQL on Unix

Problem

Solution

Discussion

See Also

14.8 Finding the Number of Rows Returned by a Query

Problem

Solution

Discussion

See Also

14.9 Talking Directly to a MySQL Database

Problem

Solution

Discussion

See Also

14.10 Talking Directly to a PostgreSQL Database

Problem

Solution

Discussion

See Also

14.11 Using Object Relational Mapping with ActiveRecord

Problem

Solution

Discussion

See Also

14.12 Building Queries Programmatically

Problem

Solution

Discussion

See Also

14.13 Validating Data with ActiveRecord

Problem

Solution

Discussion

See Also

14.14 Preventing SQL Injection Attacks

Problem

Solution

Discussion

See Also

14.15 Using Transactions in ActiveRecord

Problem

Solution

Discussion

See Also

14.16 Adding Hooks to Table Events

Problem

Solution

Discussion

See Also

14.17 Adding Taggability with a Database Mixin

Problem

Solution

Discussion

See Also

Chapter 15. Internet Services

15.1 Grabbing the Contents of a Web Page

Problem

Solution

Discussion

See Also

15.2 Making an HTTPS Web Request

Problem

Solution

Discussion

See Also

15.3 Customizing HTTP Request Headers

Problem

Solution

Discussion

See Also

15.4 Performing DNS Queries

Problem

Solution

Discussion

See Also

15.5 Sending Mail

Problem

Solution

Discussion

See Also

15.6 Reading Mail with IMAP

Problem

Solution

Discussion

See Also

15.7 Reading Mail with POP3

Problem

Solution

Discussion

See Also

15.8 Being an FTP Client

Problem

Solution

Discussion

See Also

15.9 Being a Telnet Client

Problem

Solution

Discussion

See Also

15.10 Being an SSH Client

Problem

Solution

Discussion

See Also

15.11 Copying a File to Another Machine

Problem

Solution

Discussion

15.12 Being a BitTorrent Client

Problem

Solution

Discussion

See Also

15.13 Pinging a Machine

Problem

Solution

Discussion

15.14 Writing an Internet Server

Problem

Solution

Discussion

See Also

15.15 Parsing URLs

Problem

Solution

Discussion

See Also

15.16 Writing a CGI Script

Problem

Solution

Discussion

See Also

15.17 Setting Cookies and Other HTTP Response Headers

Problem

Solution

Discussion

See Also

15.18 Handling File Uploads via CGI

Problem

Solution

Discussion

See Also

15.19 Running Servlets with WEBrick

Problem

Solution

Discussion

See Also

15.20 Creating a Real-World HTTP Client

Problem

Solution

Discussion

See Also

Chapter 16. Web Development: Ruby on Rails

16.1 Writing a Simple Rails Application to Show System Status

Problem

Solution

Discussion

See Also

16.2 Passing Data from the Controller to the View

Problem

Solution

Discussion

16.3 Creating a Layout for Your Header and Footer

Problem

Solution

Discussion

See Also

16.4 Redirecting to a Different Location

Problem

Solution

Discussion

See Also

16.5 Displaying Templates with Render

Problem

Solution

Discussion

See Also

16.6 Integrating a Database with Your Rails Application

Problem

Solution

Discussion

See Also

16.7 Understanding Pluralization Rules

Problem

Solution

Discussion

See Also

16.8 Creating a Login System

Problem

Solution

Discussion

See Also

16.9 Storing Hashed User Passwords in the Database

Problem

Solution

Discussion

See Also

16.10 Escaping HTML and JavaScript for Display

Problem

Solution

Discussion

See Also

16.11 Setting and Retrieving Session Information

Problem

Solution

Discussion

See Also

16.12 Setting and Retrieving Cookies

Problem

Solution

Discussion

See Also

16.13 Extracting Code into Helper Functions

Problem

Solution

Discussion

See Also

16.14 Refactoring the View into Partial Snippets of Views

Problem

Solution

Discussion

See Also

16.15 Adding Dynamic Effects with script.aculo.us

Problem

Solution

Discussion

See Also

16.16 Generating Forms for Manipulating Model Objects

Problem

Solution

Discussion

See Also

16.17 Creating an Ajax Form

Problem

Solution

Discussion

16.18 Exposing Web Services on Your Website

Problem

Solution

Discussion

See Also

16.19 Sending Mail with Rails

Problem

Solution

Discussion

See Also

16.20 Automatically Sending Error Messages to Your Email

Problem

Solution

Discussion

See Also

16.21 Documenting Your Website

Problem

Solution

Discussion

See Also

16.22 Unit-Testing Your Website

Problem

Solution

Discussion

See Also

16.23 Using breakpoint in Your Web Application

Problem

Solution

Discussion

See Also

Chapter 17. Web Development: Sinatra

17.1 Developing a Minimalistic Web-Services–Based Application

Problem

Solution

Discussion

See Also

17.2 Writing a Simple Sinatra Application to Show System Status

Problem

Solution

Discussion

See Also

17.3 Creating a Layout for Your Header and Footer

Problem

Solution

Discussion

See Also

17.4 Passing Data from the Controller to the View

Problem

Solution

Discussion

See Also

17.5 Redirecting to a Different Location

Problem

Solution

Discussion

See Also

17.6 Integrating a Database with Your Sinatra Application

Problem

Solution

Discussion

See Also

17.7 Setting Status Codes and Headers

Problem

Solution

Discussion

See Also

17.8 Setting and Retrieving Session Information

Problem

Solution

Discussion

See Also

17.9 Setting and Retrieving Cookies

Problem

Solution

Discussion

See Also

17.10 Sending Mail with Sinatra

Problem

Solution

Discussion

See Also

17.11 Building RESTful Web Services on Your Website

Problem

Solution

Discussion

See Also

17.12 Creating RESTful JavaScript Clients for Your Web Services

Problem

Solution

Discussion

See Also

Chapter 18. Web Services and Distributed Programming

18.1 Searching for Books on Amazon

Problem

Solution

Discussion

See Also

18.2 Finding Photos on Flickr

Problem

Solution

Discussion

See Also

18.3 Writing an XML-RPC Client

Problem

Solution

Discussion

See Also

18.4 Writing a SOAP Client

Problem

Solution

Discussion

See Also

18.5 Writing a SOAP Server

Problem

Solution

Discussion

See Also

18.6 Charging a Credit Card

Problem

Solution

Discussion

See Also

18.7 Finding the Cost to Ship Packages via UPS or FedEx

Problem

Solution

Discussion

See Also

18.8 Sharing a Hash Between Any Number of Computers

Problem

Solution

Discussion

See Also

18.9 Implementing a Distributed Queue

Problem

Solution

Discussion

See Also

18.10 Creating a Shared “Whiteboard”

Problem

Solution

Discussion

18.11 Securing DRb Services with Access Control Lists

Problem

Solution

Discussion

See Also

18.12 Automatically Discovering DRb Services with Rinda

Problem

Solution

Discussion

See Also

18.13 Proxying Objects That Can’t Be Distributed

Problem

Solution

Discussion

See Also

18.14 Storing Data on Distributed RAM with MemCached

Problem

Solution

Discussion

See Also

18.15 Caching Expensive Results with MemCached

Problem

Solution

Discussion

See Also

18.16 A Remote-Controlled Jukebox

See Also

Chapter 19. Testing, Debugging, Optimizing, and Documenting

19.1 Running Code Only in Debug Mode

Problem

Solution

Discussion

See Also

19.2 Raising an Exception

Problem

Solution

Discussion

See Also

19.3 Handling an Exception

Problem

Solution

Discussion

See Also

19.4 Retrying After an Exception

Problem

Solution

Discussion

See Also

19.5 Adding Logging to Your Application

Problem

Solution

Discussion

See Also

19.6 Creating and Understanding Tracebacks

Problem

Solution

Discussion

See Also

19.7 Writing Unit Tests

Problem

Solution

Discussion

See Also

19.8 Running Unit Tests

Problem

Solution

Discussion

See Also

19.9 Testing Code That Uses External Resources

Problem

Solution

Discussion

See Also

19.10 Using debug to Inspect and Change the State of Your Application

Problem

Solution

Discussion

See Also

19.11 Documenting Your Application

Problem

Solution

Discussion

See Also

19.12 Profiling Your Application

Problem

Solution

Discussion

See Also

19.13 Benchmarking Competing Solutions

Problem

Solution

Discussion

See Also

19.14 Running Multiple Analysis Tools at Once

Problem

Solution

Discussion

Chapter 20. Packaging and Distributing Software

20.1 Finding Libraries by Querying Gem Respositories

Problem

Solution

Discussion

See Also

20.2 Installing and Using a Gem

Problem

Solution

Discussion

See Also

20.3 Requiring a Specific Version of a Gem

Problem

Solution

Discussion

See Also

20.4 Uninstalling a Gem

Problem

Solution

Discussion

20.5 Reading Documentation for Installed Gems

Problem

Solution

Discussion

See Also

20.6 Packaging Your Code as a Gem

Problem

Solution

Discussion

See Also

20.7 Distributing Your Gems

Problem

Solution

Discussion

See Also

20.8 Installing and Creating Standalone Packages with setup.rb

Problem

Solution

Discussion

See Also

Chapter 21. Automating Tasks with Rake

21.1 Automatically Running Unit Tests

Problem

Solution

Discussion

See Also

21.2 Automatically Generating Documentation

Problem

Solution

Discussion

See Also

21.3 Cleaning Up Generated Files

Problem

Solution

Discussion

See Also

21.4 Automatically Building a Gem

Problem

Solution

Discussion

See Also

21.5 Gathering Statistics About Your Code

Problem

Solution

Discussion

See Also

21.6 Publishing Your Documentation

Problem

Solution

Discussion

See Also

21.7 Running Multiple Tasks in Parallel

Problem

Solution

Discussion

See Also

21.8 Creating a Generic Project Rakefile

Problem

Solution

See Also

Chapter 22. Multitasking and Multithreading

22.1 Running a Daemon Process on Unix

Problem

Solution

Discussion

See Also

22.2 Creating a Windows Service

Problem

Solution

Discussion

See Also

22.3 Doing Two Things at Once with Threads

Problem

Solution

Discussion

22.4 Synchronizing Access to an Object

Problem

Solution

Discussion

See Also

22.5 Terminating a Thread

Problem

Solution

Discussion

22.6 Running a Code Block on Many Objects Simultaneously

Problem

Solution

Discussion

See Also

22.7 Limiting Multithreading with a Thread Pool

Problem

Solution

Discussion

See Also

22.8 Driving an External Process with popen

Problem

Solution

Discussion

See Also

22.9 Capturing the Output and Error Streams from a Unix Shell Command

Problem

Solution

Discussion

See Also

22.10 Controlling a Process on Another Machine

Problem

Solution

Discussion

See Also

22.11 Avoiding Deadlock

Problem

Solution

Discussion

See Also

Chapter 23. User Interface

23.1 Resources

23.2 Getting Input One Line at a Time

Problem

Solution

Discussion

See Also

23.3 Getting Input One Character at a Time

Problem

Solution

Discussion

See Also

23.4 Parsing Command-Line Arguments

Problem

Solution

Discussion

See Also

23.5 Testing Whether a Program Is Running Interactively

Problem

Solution

Discussion

23.6 Setting Up and Tearing Down a Curses Program

Problem

Solution

Discussion

See Also

23.7 Clearing the Screen

Problem

Solution

Discussion

23.8 Determining Terminal Size

Problem

Solution

Discussion

See Also

23.9 Changing Text Color

Problem

Solution

Discussion

See Also

23.10 Reading a Password

Problem

Solution

Discussion

See Also

23.11 Allowing Input Editing with Readline

Problem

Solution

Discussion

See Also

23.12 Making Your Keyboard Lights Blink

Problem

Solution

Discussion

See Also

23.13 Creating a GUI Application with Tk

Problem

Solution

Discussion

See Also

23.14 Creating a GUI Application with wxRuby

Problem

Solution

Discussion

See Also

23.15 Creating a GUI Application with Ruby/GTK

Problem

Solution

Discussion

See Also

23.16 Using AppleScript to Get User Input

Problem

Solution

Discussion

See Also

Chapter 24. Extending Ruby with Other Languages

24.1 Writing a C Extension for Ruby

Problem

Solution

Discussion

See Also

24.2 Using a C Library from Ruby

Problem

Solution

Discussion

See Also

24.3 Calling a C Library Through SWIG

Problem

Solution

Discussion

See Also

24.4 Writing Inline C in Your Ruby Code

Problem

Solution

Discussion

See Also

24.5 Using Java Libraries with JRuby

Problem

Solution

Discussion

See Also

Chapter 25. System Administration

25.1 Scripting an External Program

Problem

Solution

Discussion

See Also

25.2 Managing Windows Services

Problem

Solution

Discussion

See Also

25.3 Running Code as Another User

Problem

Solution

Discussion

See Also

25.4 Running Periodic Tasks Without cron or at

Problem

Solution

Discussion

See Also

25.5 Deleting Files That Match a Regular Expression

Problem

Solution

Discussion

See Also

25.6 Renaming Files in Bulk

Problem

Solution

Discussion

See Also

25.7 Finding Duplicate Files

Problem

Solution

Discussion

See Also

25.8 Automating Backups

Problem

Solution

Discussion

See Also

25.9 Normalizing Ownership and Permissions in User Directories

Problem

Solution

Discussion

See Also

25.10 Killing All Processes for a Given User

Problem

Solution

Discussion

See Also

25.11 Using Puppet for DevOps System Administration

Problem

Solution

Discussion

See Also