The Book of Ruby by Collingbourne, Huw -- Read -- Imperial Library of Trantor

Index

The Book of Ruby

Acknowledgments Introduction

What Is Ruby? What Is Rails? Matters of Ruby Style How to Read This Book Digging Deeper Making Sense of the Text Downloading Ruby Getting the Source Code of the Sample Programs Running Ruby Programs The Ruby Library Documentation

1. Strings, Numbers, Classes, and Objects

Getting and Putting Input Strings and Embedded Evaluation Numbers Comments Testing a Condition: if..then Local and Global Variables Classes and Objects

Instance Variables Retrieving Data from an Object Messages, Methods, and Polymorphism Constructors: new and initialize Inspecting Objects

2. Class Hierarchies, Attributes, and Class Variables

Superclasses and Subclasses Passing Arguments to the Superclass Accessor Methods Attribute Readers and Writers Calling Methods of a Superclass Class Variables

3. Strings and Ranges

User-Defined String Delimiters Backquotes String Handling

Concatenation What About Commas? String Assignment Indexing into a String Removing Newline Characters: chop and chomp Format Strings

Ranges

Ranges of Strings Iterating with a Range

4. Arrays and Hashes

Arrays

Creating Arrays Multidimensional Arrays Iterating over Arrays Indexing into Arrays Copying Arrays Testing Arrays for Equality Sorting Arrays Comparing Values Array Methods

Hashes

Creating Hashes Indexing into a Hash Copying a Hash Hash Order Sorting a Hash Hash Methods

5. Loops and Iterators

for Loops Blocks and Block Parameters Iterating upto and downto Multiple Iterator Arguments while Loops

while Modifiers Ensuring a while Loop Executes at Least Once

until Loops loop

6. Conditional Statements

if..then..else and, or, and not Negation if..elsif unless if and unless Modifiers Case Statements

The === Method Alternative Case Syntax

7. Methods

Class Methods What Are Class Methods For? Class Variables Ruby Constructors: new or initialize? Singleton Methods Singleton Classes Overriding Methods Public, Protected, and Private Methods

8. Passing Arguments and Returning Values

Summarizing Instance, Class, and Singleton Methods Returning Values Returning Multiple Values Default and Multiple Arguments Assignment and Parameter Passing Integers Are Special The One-Way-In, One-Way-Out Principle Modifying Receivers and Yielding New Objects Potential Side Effects of Reliance on Argument Values Parallel Assignment

9. Exception Handling

rescue: Execute Code When Error Occurs ensure: Execute Code Whether or Not an Error Occurs else: Execute Code When No Error Occurs Error Numbers retry: Attempt to Execute Code Again After an Error raise: Reactivate a Handled Error

10. Blocks, Procs, and Lambdas

What Is a Block? Line Breaks Are Significant Nameless Functions Look Familiar? Blocks and Arrays Procs and Lambdas Block or Hash? Creating Objects from Blocks What Is a Closure? yield Blocks Within Blocks Passing Named Proc Arguments Precedence Rules Blocks as Iterators

11. Symbols

Symbols and Strings Symbols and Variables Why Use Symbols?

12. Modules and Mixins

A Module Is Like a Class . . . Module Methods Modules as Namespaces Included Modules, or “Mixins” Name Conflicts Alias Methods Mix In with Care! Including Modules from Files

13. Files and IO

Opening and Closing Files Characters and Compatibility Files and Directories Copying Files Directory Inquiries A Discursion into Recursion Sorting by Size

14. YAML

Converting to YAML Nested Sequences Saving YAML Data Omitting Variables on Saving Multiple Documents, One File A YAML Database Adventures in YAML

15. Marshal

Saving and Loading Data Omitting Variables on Saving Saving Singletons

YAML and Singletons Marshal and Singletons

16. Regular Expressions

Making Matches Match Groups MatchData Prematch and Postmatch Greedy Matching String Methods File Operations

17. Threads

Creating Threads Running Threads Going Native The Main Thread Thread Status Ensuring That a Thread Executes Thread Priorities The Main Thread Priority Mutexes Fibers

18. Debugging and Testing

IRB: Interactive Ruby Debugging Unit Testing

19. Ruby on Rails

Installing Rails

Do It Yourself . . . Or Use an “All-in-One” Installer

Model-View-Controller A First Ruby on Rails Application Create a Rails Application Create a Controller Anatomy of a Simple Rails Application The Generate Controller Script Summarized Create a View Rails Tags Let’s Make a Blog!

Create the Database Creating a MySQL Database Scaffolding Migration Partials Test It!

20. Dynamic Programming

Self-Modifying Programs eval Special Types of eval Adding Variables and Methods Creating Classes at Runtime Bindings send Removing Methods Handling Missing Methods Writing Programs at Runtime Exploring Further

A. Documenting Ruby with RDoc B. Installing MySQL for Ruby on Rails

Downloading MySQL Installing MySQL Configuring MySQL Can’t Find the Database?

C. Further Reading

Books Ebooks Websites

D. Ruby and Rails Development Software

IDEs and Editors Web Servers Databases Ruby Implementations

Index About the Author Colophon E. Updates

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