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

<=> 

        # Symbol.<=>

(from ruby core)
---
    symbol <=> other_symbol       -> -1, 0, +1, or nil

---

Compares `symbol` with `other_symbol` after calling #to_s on each of the
symbols. Returns -1, 0, +1, or `nil` depending on whether `symbol` is
less than, equal to, or greater than `other_symbol`.

`nil` is returned if the two values are incomparable.

See String#<=> for more information.

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.