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

to_proc 

        # Symbol.to_proc

(from ruby core)
---
    sym.to_proc

---

Returns a *Proc* object which responds to the given method by *sym*.

    (1..3).collect(&:to_s)  #=> ["1", "2", "3"]

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.