Hi,

At Tue, 7 Jun 2005 01:00:23 +0900,
Eric Mahurin wrote in [ruby-talk:144691]:
> Regarding duck-typing... Is there an easy way make a "duck"? 
> i.e. an object that responds to enough methods to be an
> acceptable argument to a certain methods.  For example, if I
> have a method that takes aString and uses the #size and #[i]
> methods, I could pass it something that looked just enough like
> a String to work:
> 
> alphabet = Object.duck(:[],proc{|i|?a+i},:size,proc{26})

I'd posted a feature called `behavior' in [ruby-dev:25772].

  alphabet = Object.behaving(:[]) {|i|(?a+i).chr}
  p alphabet[20] #=> "u"

-- 
Nobu Nakada