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

nil?

        # NilClass.nil?

(from ruby core)
---
    nil.nil?               -> true

---

Only the object *nil* responds `true` to `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.