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

join 

        # Pathname.join

(from ruby core)
---
    join(*args)

---

Joins the given pathnames onto `self` to create a new Pathname object.

    path0 = Pathname.new("/usr")                # Pathname:/usr
    path0 = path0.join("bin/ruby")              # Pathname:/usr/bin/ruby
        # is the same as
    path1 = Pathname.new("/usr") + "bin/ruby"   # Pathname:/usr/bin/ruby
    path0 == path1
        #=> true

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.