These files are Ruby examples used in an article on Ruby written for the ACCU (https://accu.org/).
Here's the references used in the article to save you some typing
[Bundler] http://bundler.io/
[Examples] https://github.com/codalogic/accu-ruby
[RubyDocs] http://ruby-doc.org/core-2.4.1/
[RubyDownload] https://www.ruby-lang.org/en/downloads/
[RubyGems] https://www.ruby-lang.org/en/libraries/
[RubyHome] https://www.ruby-lang.org/en/
[RubyTutorials] https://www.ruby-lang.org/en/documentation/