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

NoMethodError 

        # NoMethodError < NameError

(from ruby core)
---
Raised when a method is called on a receiver which doesn't have it
defined and also fails to respond with `method_missing`.

    "hello".to_ary

*raises the exception:*

    NoMethodError: undefined method `to_ary' for "hello":String
---
# Class methods:

    new

# Instance methods:

    args
    private_call?

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.