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

<=> 

        # Numeric.<=>

(from ruby core)
---
    self <=> other -> zero or nil

---

Returns zero if `self` is the same as `other`, `nil` otherwise.

No subclass in the Ruby Core or Standard Library uses this
implementation.

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.