This is a Ruby tree! It shows every object from the Ruby Programming Language in a tree format.
# Date.downto (from ruby core) --- d.downto(min) -> enumerator d.downto(min){|date| ...} -> self --- This method is equivalent to step(min, -1){|date| ...}.
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.