This is a Ruby tree! It shows every object from the Ruby Programming Language in a tree format.
# String.tr! (from ruby core) --- str.tr!(from_str, to_str) -> str or nil --- Translates *str* in place, using the same rules as String#tr. Returns *str*, or `nil` if no changes were made.
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.