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

each_filename 

        # Pathname.each_filename

(from ruby core)
---
    each_filename() { |filename| ... }

---

Iterates over each component of the path.

    Pathname.new("/usr/bin/ruby").each_filename {|filename| ... }
      # yields "usr", "bin", and "ruby".

Returns an Enumerator if no block was given.

    enum = Pathname.new("/usr/bin/ruby").each_filename
      # ... do stuff ...
    enum.each { |e| ... }
      # yields "usr", "bin", and "ruby".

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.