If a set of documents need to be "approved" for
external release - 
  True means they're approved
  False means they've been reviewed and are not allowed to be released
  nil means they're not reviewed yes (and are not yet allowed to be
released).
V
On Fri, 2005-02-11 at 13:31, Zach Dennis wrote:
> Trans wrote:
> > Trans wrote:
> > 
> >>>I personally always define them as:
> >>>def a?
> >>>       !!@a
> >>>end
> >>
> >>Nice, thanks.
> > 
> > 
> > Oops. Except that with Ruby it's not a simple as true and false, there
> > is also nil. I think passing nil through unchanged is advantageous as
> > it allows for yes, no, maybe (i.e. three state) value.
> > 
> 
> I have failed to see when using three state's is needed. Could you 
> provide an example where "my_obj.a?" would behave different if nil/false 
> meant nil/maybe ?
> 
> Thanks,
> 
> Zach
> 
>