This is a Ruby tree! It shows every object from the Ruby Programming Language in a tree format.
# Set.<=> (from ruby core) --- <=>(set) --- Returns 0 if the set are equal, -1 / +1 if the set is a proper subset / superset of the given set, or nil if they both have unique elements.
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.