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

reverse! 

        # Array.reverse!

(from ruby core)
---
    array.reverse! -> self

---

Reverses `self` in place:
    a = ['foo', 'bar', 'two']
    a.reverse! # => ["two", "bar", "foo"]

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.