From: Markus <markus@...>
Date: 2004-10-01T00:09:28+09:00
Subject: Re: Range syntax theory


> It's the distinction between
>   0..5 == [0, 5] # mathematical notation
> and
>   0...5 == [0, 5) # mathematical notation
> 
> In part, this is something that Ruby inherits -- I *think* -- from
> Perl, which uses the .. and ... in this way.


     It must be something pre-perl; at least, I was using this
convention (but don't recall where I picked it up) long before coming to
ruby.  I know it wasn't perl because I don't know perl.

   -- Markus

P.S. The notation is useful; (as others have pointed out) x...y is NOT a
synonym for x..y-1, although the effect is the same when you're dealing
with integers.