Ruby Essentials

Ruby Essentials is a free on-line book designed to provide a concise and easy to follow guide to learning Ruby.

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About Ruby Essentials
What is Ruby?
- The History of Ruby
- What is Ruby?
- Why is Ruby so Popular?
Getting and Installing Ruby
- Installing Ruby on Linux
- Ruby on Red Hat Enterprise and Fedora Linux
- Ruby on Ubuntu and Debian Linux
- Ruby on Microsoft Windows
Simple Ruby Examples
- The Most Basic Ruby Example
- Executing Ruby from the Command Line
- Interactive Ruby Execution
- Executing Ruby from a File
- Creating a Self Contained Ruby Executable on Linux or UNIX
- Associating Ruby Files on Windows
Commenting Ruby Code
- What is Exactly is Commenting
- Single Line Ruby Comments
- Comments on Lines of Code
- Multi Line or Block Ruby Comments
Understanding Ruby Variables
- Ruby Constants
- Ruby and Variable Dynamic Typing
- Declaring a Variable
- Identifying a Ruby Variable Type
- Changing Variable Type
- Converting Variable Values
Ruby Variable Scope
- What is Variable Scope?
- Detecting the Scope of a Ruby Variable
- Ruby Local Variables
- Ruby Global Variables
- Ruby Class Variables
- Ruby Instance Variables
- Ruby Constant Scope
Ruby Number Classes and Conversions
- Ruby Number Classes
- Converting Numbers in Ruby
Ruby Methods
- Declaring and Calling a Ruby Method
- Passing Arguments to a Method
- Passing a Variable Number of Arguments to a Method
- Returning a Value from a Function
- Ruby Method Aliases
Ruby Ranges
- Ruby Sequence Ranges
- Using Range Methods
- Ruby Ranges as Conditional Expressions
- Ruby Range Intervals
- Ranges in case Statements
Understanding Ruby Arrays
- What is a Ruby Array
- How to Create a Ruby Array
- Populating an Array with Data
- Finding Out Information About a Ruby Array
- Accessing Array Elements
- Finding the Index of an Element
Advanced Ruby Arrays
- Combining Ruby Arrays
- Intersection, Union and Difference
- Identifying Unique Array Elements
- Pushing and Popping Array Elements
- Ruby Array Comparisons
- Modifying Arrays
- Deleting Array Elements
- Sorting Arrays
Ruby Operators
- The Anatomy of a Ruby Operation
- Performing Ruby Arithmetic using Operators
- Ruby Assignment Operators
- Parallel Assignment
- Ruby Comparison Operators
- Ruby Bitwise Operators
Ruby Operator Precedence
- An Example of Ruby Operator Precedence
Ruby Math Functions and Methods
- Ruby Math Constants
- Ruby Math Methods
- Some Examples
Understanding Ruby Logical Operators
Ruby Object Oriented Programming
- What is an Object?
- What is a Class?
- Defining a Ruby Class
- Creating an Object from a Class
- Instance Variables and Accessor Methods
- Ruby Class Variables
- Instance Methods
- Ruby Class Inheritance
Ruby Flow Control
- The Ruby if Statement
- Using else and elsif Constructs
- The Ruby Ternary Operator
The Ruby case Statement
- Number Ranges and the case statement
Ruby While and Until Loops
- The Ruby While Loop
- Breaking from While Loops
- unless and until
Looping with for and the Ruby Looping Methods
- The Ruby for Loop
- The Ruby times Method
- The Ruby upto Method
- The Ruby downto Method
Ruby Strings - Creation and Basics
- Creating Strings in Ruby
- Quoting Ruby Strings
- General Delimited Strings
- Ruby Here Documents
- Getting Information About String Objects
Ruby String Concatenation and Comparison
- Concatenating Strings in Ruby
- Freezing a Ruby String
- Accessing String Elements
- Comparing Ruby Strings
- Case Insensitive String Comparisons
Ruby String Replacement, Substitution and Insertion
- Changing a Section of a String
- Ruby String Substitution
- Repeating Ruby Strings
- Inserting Text Into a Ruby String
- Ruby chomp and chop Methods
- Reversing the Characters in a String
Ruby String Conversions
- Converting a Ruby String to an Array
- Changing the Case of a Ruby String
- Performing String Conversions
Ruby Directory Handling
- Changing Directory in Ruby
- Creating New Directories
- Directory Listings in Ruby
Working with Files in Ruby
- Creating a New File with Ruby
- Opening Existing Files
- Renaming and Deleting Files in Ruby
- Getting Information About Files
- Reading and Writing Files
Working with Dates and Times in Ruby
- Accessing the Date and DateTime Classes in Ruby
- Working with Dates in Ruby
- Calculating the Difference Between Dates
Useful Ruby Links and Resources

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Ruby Essentials

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