This is a Ruby tree! It shows every object from the Ruby Programming Language in a tree format.
# Set.to_s (from ruby core) --- to_s() --- (This method is an alias for Set#inspect.) Returns a string containing a human-readable representation of the set ("#<Set: {element1, element2, ...}>").
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.