This is a Ruby tree! It shows every object from the Ruby Programming Language in a tree format.
# String.downcase! (from ruby core) --- downcase!(*options) -> self or nil --- Downcases the characters in `self`; returns `self` if any changes were made, `nil` otherwise: s = 'Hello World!' # => "Hello World!" s.downcase! # => "hello world!" s # => "hello world!" s.downcase! # => nil The casing may be affected by the given `options`; see [Case Mapping](doc/case_mapping_rdoc.html). Related: String#downcase, String#upcase, String#upcase!.
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.