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

<=> 

        # Time.<=>

(from ruby core)
---
    time <=> other_time -> -1, 0, +1, or nil

---

Compares `time` with `other_time`.

-1, 0, +1 or nil depending on whether `time` is less than, equal to, or
greater than `other_time`.

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

    t = Time.now       #=> 2007-11-19 08:12:12 -0600
    t2 = t + 2592000   #=> 2007-12-19 08:12:12 -0600
    t <=> t2           #=> -1
    t2 <=> t           #=> 1

    t = Time.now       #=> 2007-11-19 08:13:38 -0600
    t2 = t + 0.1       #=> 2007-11-19 08:13:38 -0600
    t.nsec             #=> 98222999
    t2.nsec            #=> 198222999
    t <=> t2           #=> -1
    t2 <=> t           #=> 1
    t <=> t            #=> 0

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.