I Love Ruby

I Love Ruby

By Karthikeyan A K
Book Description

Ruby is an easy to learn programming language, it was invented by a guy named Matz in Japan. Ruby is a free software and can be used by any one for zero cost. Ruby's popularity was initially confined to Japan, later it slowly trickled out to rest of the world. Things changed with the emergence of Ruby on Rails which is a popular web-development framework written with Ruby.

I was thrilled when I started to program in Ruby. One of my first application was a student ranking software for my mom who was a teacher. I was able to write the console based application in just 32 lines. This opened my eyes and made me realize the power of Ruby. The language was simple, easy to learn and nearly perfect. Currently I am an professional Ruby on Rails programmer working in TechArtUs.

This book is written for GNU/Linux (Debian distro) users, thats because I think GNU/Linux will conquer desktops of programmers in near future. Almost all who have Debian GNU/Linux based distro should feel at home while trying to learn Ruby using this book. If you are using other operating systems like Solaris, OSX or Windows please contact your Operating System help channels to learn how to install or get started with Ruby.

Table of Contents
  • I Love Ruby
  • Copyright
  • Getting this book
    • Contacting the author
  • Installing Ruby
    • Installing Ruby on Debian flavor GNU/Linux
    • Installing IDE
  • Online Resources
    • Ruby Website
    • Twitter
  • Getting Started
    • Interactive Ruby
    • Doing some Math
      • Space doesn't matter
      • Decimals
    • Variables
      • Naming Convention
      • The underscore – a special variable
    • Constants
    • Strings
      • String Functions
      • Escape sequence
    • Using Text Editor
    • Printing Something
    • Getting Input
    • Comments
  • Comparison and Logic
    • Logical Operators
      • true != “true”
    • ===
    • if
    • if else
    • elsif
    • if then else
    • unless
    • unless else
    • case when
    • case when, checking the class type
    • case when and ranges
    • case when and regular expressions
    • case when and lambdas
    • case when and matcher classes
    • ? :
    • Assigning logic statement to variables
  • Loops
    • downto
    • times
    • upto
    • step
    • while
    • until
    • break
    • next
    • redo
    • loop
  • Arrays
    • More on Array
    • Array dig
    • Set operations
    • Empty array is true
    • Compacting Arrays
    • Transforming array values
      • Collect
      • keep_if
      • delete_if
    • Read the ruby doc
  • Hashes and Symbols
    • Default values in Hash
    • Looping hashes
    • More way of hash creation
    • Using symbols
    • String, frozen string & symbol, their memory foot print
    • Compacting Hashes
    • Transforming hash values
    • Read the rubydoc
  • Ranges
    • Ranges used in case .. when
    • Checking Intervals
    • Using triple dots …
  • Functions
    • Argument Passing
    • Default Argument
    • Passing array to a function
    • Returning Values
    • Keyword arguments
    • Recursive function
    • Variable number of arguments
    • Hashes to functions
  • Variable Scope
    • Global Variables
  • Classes & Objects
    • Creating a Square
    • Functions in Class
    • Initializers or Constructors
    • Unexposed instance variables
    • Private Methods
    • Class variables and methods
    • Inheritance
    • Overriding Methods
    • The super function
    • Private, public and protected in inheritance
    • Extending class
    • Reflection
    • Encapsulation
    • Polymorphism
    • Class Constants
    • Function alias
  • Safe Navigation
  • Breaking large programs
  • Struct and OpenStruct
  • Rdoc
    • Reading Ruby Documentation
    • Creating Documentation
  • Ruby Style Guides
  • Modules and Mixins
    • Calling functions without include
    • Classes in modules
    • Mixins
  • Shebang
  • Date and Time
    • Days between two days
    • How many days have you lived?
  • Files
    • Storing output into files
    • Taking file as input
    • File copy – a kind of
    • Displaying a file
    • Reading file line by line
    • Open and new – the difference
    • Defining our own line endings
    • Reading byte by byte
    • Reading single character at a time
    • Renaming files
    • Finding out position in a file
    • Writing into files
    • Appending content into files
    • Storing objects into files
      • Pstore
      • YAML
  • Proc, Lambdas and Blocks
    • Passing parameters
    • Passing Proc to methods
    • Returning Proc from function
    • Proc and Arrays
    • Lambda
    • Passing Argument to Lambda
    • Proc and Lambdas with Functions
    • The second difference
    • Lambda and Arrays
    • Blocks and Functions
  • Multi Threading
    • Scope of thread variables
    • Thread Exclusion
    • Deadlocks
    • Creating multiple threads
    • Thread Exception
    • Thread Class Methods
    • Thread Instance Methods
  • Exception Handling
    • Exception and Threads
    • Raising Exceptions
  • Regular Expressions
    • Creating an empty regexp
    • Detecting Patterns
    • Things to remember
    • The dot
    • Character classes
    • Scanning
    • Captures
    • MatchData class
    • Anchors and Assertions
      • Anchors
      • Assertions
    • Ignoring Cases
    • Ignore Spaces
    • Dynamic Regexp
  • Gems
    • Searching a gem
    • Installing gem
    • Viewing Documentation
    • Using gem
    • The Gemfile
    • Creating a gem
    • Uninstalling a Gem
  • Network Programming
  • Meta Programming
    • Send
    • Method Missing
    • Define Method
    • Class Eval
    • Instance Eval
  • Benchmark
  • Test Driven Development
  • Underscore
  • An important Math Discovery
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