From: ara.t.howard@...
Date: 2007-02-18T06:16:34+09:00
Subject: Re: Oppinions on RCR for dup on immutable classes

On Sun, 18 Feb 2007, Gregory Brown wrote:

> On 2/17/07, ara.t.howard@noaa.gov <ara.t.howard@noaa.gov> wrote:
>>  one cannot
>> know in advance whether it's ok to call something - even if the object
>> responds to it.
>
> With this in mind, what do you guys think of this work around?
>
>>> [sandal@metta payroll_camping]$ irb
>>> class Object
>>>   def dup?
>>>     dup
>>>   rescue TypeError
>>>     false
>>>   end
>>> end
> => nil
>>> 3.dup?
> => false
>>> 3.dup? || 3
> => 3
>>> "foo".dup?
> => "foo"
>

same semantics - but nice and clean.

-a
-- 
we can deny everything, except that we have the possibility of being better.
simply reflect on that.
- the dalai lama