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

class_variable_defined? 

        # Module.class_variable_defined?

(from ruby core)
---
    obj.class_variable_defined?(symbol)    -> true or false
    obj.class_variable_defined?(string)    -> true or false

---

Returns `true` if the given class variable is defined in *obj*. String
arguments are converted to symbols.

    class Fred
      @@foo = 99
    end
    Fred.class_variable_defined?(:@@foo)    #=> true
    Fred.class_variable_defined?(:@@bar)    #=> false

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.