This is a Ruby tree! It shows every object from the Ruby Programming Language in a tree format.
# Numeric.arg (from ruby core) --- num.arg -> 0 or float num.angle -> 0 or float num.phase -> 0 or float --- Returns 0 if the value is positive, pi otherwise.
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.