methopara is a gem that enables us to use Method#parameters with Ruby-1.9.1. It was originally made by @ko1_twitter, the creater of YARV, at the previous meet-up of asakusa.rb.

And this time, I added an interface to use it for UnboundMethod. Now you can use UnboundMethod#parameters with new methopara, like this.

   1  require 'rubygems'
   2  require 'methopara'
   3  
   4  class Foo
   5    def foo(a,b) end
   6  end
   7  Foo.instance_method(:foo).parameters
   8  #=> [[:req, :a], [:req, :b]]

Enjoy!