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

<=> 

        # Pathname.<=>

(from ruby core)
---
    <=>(p1)

---

Provides a case-sensitive comparison operator for pathnames.

    Pathname.new('/usr') <=> Pathname.new('/usr/bin')
        #=> -1
    Pathname.new('/usr/bin') <=> Pathname.new('/usr/bin')
        #=> 0
    Pathname.new('/usr/bin') <=> Pathname.new('/USR/BIN')
        #=> 1

It will return `-1`, `0` or `1` depending on the value of the left
argument relative to the right argument. Or it will return `nil` if the
arguments are not comparable.

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.