Learning Ruby with the Ruby Koans

The Koans walk you along the path to enlightenment in order to learn Ruby. The goal is to learn the Ruby language, syntax, structure, and some common functions and libraries. We also teach you culture. Testing is not just something we pay lip service to, but something we live. It is essential in your quest to learn and do great things in the language.

Download : KOANS

The Structure:

The koans are broken out into areas by file, hashes are covered in about_hashes.rb, modules are introduced in about_modules.rb, etc. They are presented in order in the path_to_enlightenment.rb file. Each koan builds up your knowledge of Ruby and builds upon itself. It will stop at the first place you need to correct. Some koans simply need to have the correct answer substituted for an incorrect one. Some, however, require you to supply your own answer. If you see the method __ (a double underscore) listed, it is a hint to you to supply your own code in order to make it work correctly.
 

Installing Ruby: These instructions are for *nix platforms. We also have Windows instructions. In order to run the koans you need Ruby installed. If you do not already have Ruby setup, please visit http://ruby-lang.org/en/downloads for operating system specific instructions.

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Courtesy: Rubykoans.com