This is a Ruby tree! It shows every object from the Ruby Programming Language in a tree format.
# Set.map! (from ruby core) --- map!() --- (This method is an alias for Set#collect!.) Replaces the elements with ones returned by `collect()`. Returns an enumerator if no block is given.
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.