All code examples from Sandi Metz's book Practical Object Oriented Design in Ruby Project divides the book into commits by code example and tag by chapter

Add this line to your application's Gemfile:

gem 'practical_oo_design'

And then execute:

$ bundle

Or install it yourself as:

$ gem install practical_oo_design

ruby lib/practical_oo_design

Probably no need for this

1. Fork it ( https://github.com/[my-github-username]/practical_oo_design/fork )
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create a new Pull Request