From: "Guy N. Hurst" <gnhurst@...>
Date: 2001-01-07T05:04:43+09:00
Subject: [ruby-talk:8758] Re: (start..end) where start > end

David Alan Black wrote:
> 
> On Sun, 7 Jan 2001, Robert Gustavsson wrote:
> 
> > >> (7..0).each do
> >
> > >Try this:
> > >   7.downto(0) do |n| puts n end
> > >   (0..7).to_a.reverse.each do |n| puts n end
> >
> > Do you agree with me when I say that (7..0) is more beautiful? And it would
> > probably be more efficient too.
> 
> It's certainly more beautiful than the to_a.reverse version.  I don't
> mind #downto too much -- though (7..0) would be nice.  I wonder if
> there's something inherent in the definition of a range (as opposed to
> an array) which precludes that.
> 

This leads into the discussion (again ;-) about #succ and 
why there isn't something like #pred etc.

If someone came up with a good algorithm/method to do the inverse 
of #succ, I think matz would be willing to talk about it.

cf. [ruby-talk:5868]


Guy N. Hurst

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