From: Hal Fulton <hal9000@...>
Date: 2004-03-05T06:17:32+09:00
Subject: Re: dynamic assignment of instance variables

Mark Hubbart wrote:
> On Mar 4, 2004, at 12:04 PM, Hal Fulton wrote:
> 
>> When did this start working? :) This seems to be a good step
>> toward singletons for Fixnums (unless those are already working
>> also, and I haven't noticed).
>>
>  >> 23.instance_eval {@prime = true}
> => true
>  >> 24.instance_eval {@prime = false}
> => false
>  >> 23.instance_eval {@prime}
> => true
>  >> 24.instance_eval {@prime}
> => false
>  >> RUBY_VERSION
> => "1.6.8"
> 
> 1.6.x is the earliest version I've worked with... I remember trying this 
> when I first started out with ruby :) I thought it was a nifty trick. 
> You still can't define singleton methods though, just add instance 
> variables. Though, I suppose you could add a proc object as an instance 
> variable.

The last time I tried this, it was a little deceptive. A variable
that you added to one Fixnum was the same for all Fixnums.

Hal