This is a Ruby tree! It shows every object from the Ruby Programming Language in a tree format.
# Set.< (from ruby core) --- <(set) --- (This method is an alias for Set#proper_subset?.) Returns true if the set is a proper subset of the given set.
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.