This is a Ruby tree! It shows every object from the Ruby Programming Language in a tree format.
# DateTime.hour (from ruby core) --- d.hour -> fixnum --- Returns the hour (0-23). DateTime.new(2001,2,3,4,5,6).hour #=> 4
This is MURDOC! A Ruby documentation browser inspired by Smalltalk-80. It allows you to learn about Ruby by browsing through its class hierarchies, and see any of its methods.