From: "David A. Black" <dblack@...>
Date: 2007-10-23T00:02:57+09:00
Subject: Re: Conflicts between using respond_to? and extending Ruby

Hi --

On Mon, 22 Oct 2007, David A. Black wrote:

> What I've always called the soft/hard duck typing distinction isn't
> quite the same as what you're calling the chicken/duck distinction,
> though, in the sense that I rule is_a? and kind_of? completely out of
> bounds as duck typing of any kind.

I didn't put that very clearly, since you do too. What I mean is, it's
like this:


Rick:

   Chicken-typing
     is_a?/kind_of?
     respond_to?
   Duck-typing
     obj.message

David:

   Class-checking:
     is_a?/kind_of
   Soft duck:
     respond_to?
   Hard duck:
     obj.message


or something.


David

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