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

def_method 

        # ERB.def_method

(from ruby core)
---
    def_method(mod, methodname, fname='(ERB)')

---

Define *methodname* as instance method of *mod* from compiled Ruby
source.

example:
    filename = 'example.rhtml'   # 'arg1' and 'arg2' are used in example.rhtml
    erb = ERB.new(File.read(filename))
    erb.def_method(MyClass, 'render(arg1, arg2)', filename)
    print MyClass.new.render('foo', 123)

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.