From Techotopia

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

	Table of Contents	Next
		About Ruby Essentials

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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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	Table of Contents	Next
		About Ruby Essentials