From: Matt Armstrong <matt@...>
Date: 2002-02-14T08:22:16+09:00
Subject: Re: qualms about respond_to? idiom

David Alan Black <dblack@candle.superlink.net> writes:

> Hi --
>
> On Thu, 14 Feb 2002, Dave Thomas wrote:
>
>>   module StartTag; end
>>
>> Then we have
>>
>>   do_somthing if e.kind_of? StartTag
>>
>> Does that communicate the intent?
>
> Isn't it a return to branching on type, though?

Using respond_to? is a form of branching on type in any case.

Dave is using a module to communicate that a particular class conforms
to a particular interface -- which allows the use of kind_of? to test
for the interface.

-- 
matt