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

hash 

        # Array.hash

(from ruby core)
---
    array.hash -> integer

---

Returns the integer hash value for `self`.

Two arrays with the same content will have the same hash code (and will
compare using eql?):
    [0, 1, 2].hash == [0, 1, 2].hash # => true
    [0, 1, 2].hash == [0, 1, 3].hash # => false

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.