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

end 

        # Range.end

(from ruby core)
---
    self.end -> object

---

Returns the object that defines the end of `self`.

    (1..4).end  # => 4
    (1...4).end # => 4
    (1..).end   # => nil

Related: Range#begin, Range#last.

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.