From: Bill Atkins <batkins57@...>
Date: 2004-10-30T03:05:46+09:00
Subject: Re: true? & false?

I'm still skeptical about the usefulness of this, but I think the best
implementation would be:

def true.true?
  true
end

def false.false?
  false
end

I'm not actually sure, though, that these wouldn't belong in TrueClass
and FalseClass.

Bill

On Sat, 30 Oct 2004 01:28:39 +0900, Mohammad Khan <mkhan@lextranet.com> wrote:
> On Fri, 2004-10-29 at 12:01, trans. (T. Onoma) wrote:
> > On Friday 29 October 2004 11:55 am, Mohammad Khan wrote:
> > | On Fri, 2004-10-29 at 11:48, Bill Atkins wrote:
> > | > Well, all Objects must be nil or non-nil, but the idea of true/false
> > | > doesn't apply to all objects.
> > |
> > | I agree with you on this point.
> > |
> > | I would ask,
> > | If I would like to have true? and false?
> > | what would be best class to put in?
> >
> > But it must be responded to by all classes.
> >
> >   # true?&false?.rb
> >   # As suggested by Mohammad Khan
> >
> >   class Object
> >     def true? ; false ; end
> >     def false? ; false ; end
> >   end
> > 
> In my mind, I had this:
> 
> class Object
>     def true?
>         return self == true ? true : false
>     end
> 
>     def false?
>         return self == false ? true : false
>     end
> end
> 
> irb(main):009:0> n = nil
> => nil
> irb(main):010:0> n.nil?
> => true
> irb(main):011:0> n.true?
> => false
> irb(main):012:0> n.false?
> => false
> irb(main):013:0> t = true
> => true
> irb(main):015:0> t.true?
> => true
> irb(main):016:0> t.false?
> => false
> irb(main):017:0> f = false
> => false
> irb(main):018:0> f.nil?
> => false
> irb(main):019:0> f.true?
> => false
> irb(main):020:0> f.false?
> => true
> 
> 
> 
> >   class TrueClass
> >     def true? ; true ; end
> >   end
> >
> >   class FalseClass
> >     def false? ; true ; end
> >   end
> >
> > Is this what you had in mind?
> >
> > T.
> --
> Mohammad Khan <mkhan@lextranet.com>
> Legal Computer Solutions, Inc.
> 
>