This is a Ruby tree! It shows every object from the Ruby Programming Language in a tree format.
# NoMatchingPatternKeyError.matchee (from ruby core) --- no_matching_pattern_key_error.matchee -> object --- Return the matchee associated with this NoMatchingPatternKeyError exception.
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.