This is a Ruby tree! It shows every object from the Ruby Programming Language in a tree format.
# NameError.local_variables (from ruby core) --- name_error.local_variables -> array --- Return a list of the local variable names defined where this NameError exception was raised. Internal use only.
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.