From: Joel VanderWerf <vjoel@...>
Date: 2006-09-21T03:39:12+09:00
Subject: Re: Ducktator - A Duck Type Validator

Austin Ziegler wrote:
> On 9/20/06, Ola Bini <ola.bini@ki.se> wrote:
>> The problem with "just use it", is that you will have no control over
>> error handling in this case.
> 
> This is demonstrably untrue. Duck typing is not about validation. It's
> about trusting your callers to do the right thing -- and then doing
> the right thing when they don't.

To extend Austin's point a little: In ruby, it really has to be this 
way. What if an object responds to a message by way of method_missing? 
There's no easy way to validate that.

-- 
       vjoel : Joel VanderWerf : path berkeley edu : 510 665 3407