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

size 

        # StringScanner.size

(from ruby core)
---
    size

---

Returns the amount of subgroups in the most recent match. The full match
counts as a subgroup.

    s = StringScanner.new("Fri Dec 12 1975 14:39")
    s.scan(/(\w+) (\w+) (\d+) /)       # -> "Fri Dec 12 "
    s.size                             # -> 4

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.