Ecosyste.ms: Awesome

An open API service indexing awesome lists of open source software.

Awesome Lists | Featured Topics | Projects

https://github.com/ferhatelmas/koans

Learning ruby by edge cases
https://github.com/ferhatelmas/koans

Last synced: 26 days ago
JSON representation

Learning ruby by edge cases

Awesome Lists containing this project

README 

        
= EdgeCase Ruby Koans



The Ruby 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.



== 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



If you do not have Ruby setup, please visit http://ruby-lang.org/en/downloads/ for

operating specific instructions.  In order to run this you need ruby and rake

installed. To check the installations simply type:



*nix platforms from any terminal window:



   [~] $ ruby --version

   [~] $ rake --version



Windows from the command prompt (cmd.exe)



   c:\ruby --version

   c:\rake --version



If you don't have rake installed, just run `gem install rake`



Any response for Ruby with a version number greater than 1.8 is fine (should be

around 1.8.6 or more). Any version of rake will do.



== Generating the Koans



A fresh checkout will not include the koans, you will need to generate

them.



    [ruby_koans] $ rake gen                       # generates the koans directory



If you need to regenerate the koans, thus wiping your current `koans`,



    [ruby_koans] $ rake regen                     # regenerates the koans directory, wiping the original



== The Path To Enlightenment



You can run the tests through rake or by calling the file itself (rake is the

recommended way to run them as we might build more functionality into this task).



*nix platforms, from the koans directory



    [ruby_koans] $ rake                           # runs the default target :walk_the_path

    [ruby_koans] $ ruby path_to_enlightenment.rb  # simply call the file directly



Windows is the same thing



    c:\ruby_koans\rake                             # runs the default target :walk_the_path

    c:\ruby_koans\ruby path_to_enlightenment.rb    # simply call the file directly



=== Red, Green, Refactor



In test-driven development the mantra has always been, red, green, refactor.  Write a

failing test and run it (red), make the test pass (green), then refactor it (that is

look at the code and see if you can make it any better.  In this case you will need

to run the koan and see it fail (red), make the test pass (green), then take a

moment and reflect upon the test to see what it is teaching you and improve the

code to better communicate its intent (refactor).



The very first time you run it you will see the following output:



    [ ruby_koans ] $ rake

    (in /Users/person/dev/ruby_koans)

    cd koans



    Thinking AboutAsserts

      test_assert_truth has damaged your karma.



    You have not yet reached enlightenment ...

     is not true.



    Please meditate on the following code:

    ./about_asserts.rb:10:in `test_assert_truth'

    path_to_enlightenment.rb:27



    mountains are merely mountains



You have come to your first stage. If you notice it is telling you where to look for

the first solution:



    Please meditate on the following code:

    ./about_asserts.rb:10:in `test_assert_truth'

    path_to_enlightenment.rb:27



We then open up the about_asserts.rb file and look at the first test:



    # We shall contemplate truth by testing reality, via asserts.

    def test_assert_truth

      assert false                # This should be true

    end



We then change the +false+ to +true+ and run the test again.  After you are

done, think about what you are learning.  In this case, ignore everything except

the method name (+test_assert_truth+) and the parts inside the method (everything

before the +end+).



In this case the goal is for you to see that if you pass a value to the +assert+

method, it will either ensure it is +true+ and continue on, or fail if in fact

the statement is +false+.



== Inspiration



A special thanks to Mike Clark and Ara Howard for inspiring this

project.  Mike Clark wrote an excellent blog post about learning Ruby

through unit testing. This sparked an idea that has taken a bit to

solidify, that of bringing new rubyists into the community through

testing. Ara Howard then gave us the idea for the Koans in his ruby

quiz entry on Meta Koans (a must for any rubyist wanting to improve

their skills).  Also, "The Little Lisper" taught us all the value of

the short questions/simple answers style of learning.



Mike Clark's post ::  http://www.clarkware.com/cgi/blosxom/2005/03/18

Meta Koans        ::  http://rubyquiz.com/quiz67.html

The Little Lisper ::  http://www.amazon.com/Little-LISPer-Third-Daniel-Friedman/dp/0023397632



== Other Resources



The Ruby Language               ::  http://ruby-lang.org

Try Ruby in your browser        ::  http://tryruby.org



Dave Thomas' introduction to Ruby Programming Ruby (the Pick Axe) ::  http://pragprog.com/titles/ruby/programming-ruby



Brian Marick's fantastic guide for beginners Everyday Scripting with Ruby    ::  http://pragprog.com/titles/bmsft/everyday-scripting-with-ruby



= Other stuff



Author         :: Jim Weirich 

Author         :: Joe O'Brien 

Issue Tracker  :: http://www.pivotaltracker.com/projects/48111

Requires       :: Ruby 1.8.x or later and Rake (any recent version)



= License



http://i.creativecommons.org/l/by-nc-sa/3.0/88x31.png



RubyKoans is released under a Creative Commons,

Attribution-NonCommercial-ShareAlike, Version 3.0

(http://creativecommons.org/licenses/by-nc-sa/3.0/) License.