From: Daniel Baird <danielbaird@...>
Date: 2006-03-27T16:10:31+09:00
Subject: Re: Duck typing bunches of strings

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maybe you just want anything that has respond_to? :each and isn't a String.

From memory String doing Enumerable is a bit of a special case; if you
eliminate just String and any of it's subclasses you're probably left with
the "real" Enumerables.

;Daniel


On 27/03/06, listrecv@gmail.com <listrecv@gmail.com> wrote:
>
> In my quest to master the fine art of duck typing / overloading, I've
> run into this probem:
>
> How can I identify a collection?
> The problem is: String mixes in Enumerable, although it ain't a
> collection.
>
> My method wants to act differently if it's given a collection, then if
> it's just given a single object.  I would check .respond_to? :each -
> but String does, unfortunately.
>
> Currently, I'm forced to do .kind_of? Array - but this ain't duck
> typing.
>
> Any ideas?  I'd like to separate Array, Hash, Set, etc. etc. from
> single member objects.
>
>
>


--
Daniel Baird
http://danielbaird.com (TiddlyW;nks! :: Whiteboard Koala :: Blog :: Things
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