From: Brian Candler <b.candler@...>
Date: 2009-06-29T19:11:43+09:00
Subject: Re: Attr Methods and object setters

David Masover wrote:
> On Saturday 27 June 2009 10:26:51 pm Daniel DeLorme wrote:
> 
>> Nothing = Object.new
>> def name(value = Nothing)
>>    @name = value unless value == Nothing
>>    @name
>> end
> 
> Ok, I guess you have to be trying, but I can still break this:
> 
> class Everything
>   def == other
>     true
>   end
> end
> 
> name Everything.new
> 
> And the way to fix it:
> 
> Nothing = Object.new
> def name(value = Nothing)
>   @name = value unless Nothing == value
>   @name
> end

I believe that "same object" is slightly better expressed by:

  Nothing.equal? value

although in this case, for an instance of Object, it should be the same.
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