This is a Ruby tree! It shows every object from the Ruby Programming Language in a tree format.
# NilClass.to_f (from ruby core) --- nil.to_f -> 0.0 --- Always returns zero. nil.to_f #=> 0.0
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.