From: Phil Tomson <rubyfan@...>
Date: 2006-08-15T03:49:56+09:00
Subject: Re: Get formal parameter names of a method?

On 8/14/06, Jeff Cohen <cohen.jeff@gmail.com> wrote:
> Is there a way to reflect on a method to get the declard names of the
> parameters?
>
> class Equipment
>
>  def install(tool, packaging)
>  end
>
> end
>
> I can do this:
>
> m = Equipment.new.method(:install)
> m.arity  # => 2
>
> I want to somehow find out that the client code has declared the
> parameters named 'tool' and 'packaging'.
>
> Is this possible somehow?  I feel like it should be, but I can't quite
> figure it out.
>
> Thanks!
> Jeff
>

the only way you could do this now would be to use ParseTree:

http://rubyforge.org/projects/parsetree/

Maybe there will be a built-in way to do this in 2.0?

Phil