From: "Gray, Jeff" <jeff.gray@...>
Date: 2002-06-06T04:22:19+09:00
Subject: RE: Is this a bug in the defined? operator?

> From: matz@ruby-lang.org [mailto:matz@ruby-lang.org]
> Sent: Tuesday, June 04, 2002 7:39 PM
> To: ruby-talk@ruby-lang.org
> Subject: Re: Is this a bug in the defined? operator?
> 
> In message "Is this a bug in the defined? operator?"
>     on 02/06/05, "Gray, Jeff" <jeff.gray@intel.com> writes:
> 
> |The behavior of the following code seems like a bug to me:
> 
> No, local variable scope is *static*, not dynamic, so that:

Aha.

> I think what you want is
> 
> foo = false
> [1, 2, 3, 4].each { |x|
>   if foo 
>     puts "foo is set"
>   else
>     puts "foo not set"
>     foo = true
>   end
> }
> 
> 							matz.

Actually, what I was going for in the first place that led me to this
observation was a quick-n-dirty three-state "boolean": true, false, and
unknown.  It seemed at the time that 'defined?' would get me the equivalent
of the unknown state.

Thanks for the quick response!

 - jeff