From: dblack@...
Date: 2007-03-02T11:26:30+09:00
Subject: Re: Duck Typing  Hash-Like Objects

Hi --

On Fri, 2 Mar 2007, Gary Wright wrote:

> On Mar 1, 2007, at 7:38 PM, James Edward Gray II wrote:
>> You're still type checking, you're just doing it in a more fragile way. 
>> If you want to type check, use the class, I say.
>
> Yet if I test for (Hash == mystery_obj) that would not
> allow someone to pass an RBTree object instead, which I think
> is a very reasonable thing to allow and works just fine if
> I only use #fetch.

I had the impression James was talking about the Integer and String
methods, though then again those aren't actually the classes.  So I'm
not sure what he meant :-)  But I don't think it was just to test
class membership, since that manifestly doesn't help in the kind of
situation you're describing.


David

-- 
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