From: Srinivas JONNALAGADDA <srinivas.j@...>
Date: 2006-07-25T13:25:46+09:00
Subject: Re: I'll have the duck!

On Tue, 2006-07-25 at 02:49 +0900, transfire@gmail.com wrote:
> I wonder then, if we take up John Carter's notion on duck as mixin,
> then Enumerable can be defined as:
> 
>   ducktype :each do
>     def collect
>       each{ |e| yield(e) }
>     end
>     ...
>   end
> 
>From the code above, this appears to be going in the direction of formal
'interface' concept. If 'each' is a "ducktype", and 'each' has a set of
well defined methods, except for the fact that code exists in those
methods, this is tantamount to publishing an interface.

>From the little that I understand, the whole concept of duck typing is
about *not* being concerned with a full published interface (or, a full
published inheritance) of the receiver; rather, we are only concerned
with whether the receiver answers the _current_ message.

I could be wrong in understanding your code example, though!

Greetings,
JS