This is a Ruby tree! It shows every object from the Ruby Programming Language in a tree format.

superclass 

        # Class.superclass

(from ruby core)
---
    class.superclass -> a_super_class or nil

---

Returns the superclass of *class*, or `nil`.

    File.superclass          #=> IO
    IO.superclass            #=> Object
    Object.superclass        #=> BasicObject
    class Foo; end
    class Bar < Foo; end
    Bar.superclass           #=> Foo

Returns nil when the given class does not have a parent class:

    BasicObject.superclass   #=> nil

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.