From: Phrogz <gavin@...>
Date: 2007-06-29T00:15:02+09:00
Subject: Re: Array Problem, sort Array

On Jun 28, 7:53 am, John Joyce <dangerwillrobinsondan...@gmail.com>
wrote:
> > # On Jun 27, 10:17 pm, Pe�a, Botp <b...@delmonte-phil.com> wrote:
> > # >   irb(main):013:0> [nil].sort
> > # >   => [nil]
>
> Let's do some philosophy!
> But if an array has only one element and the element is nil, is it
> really an array?
> It is an object of Class Array.
> Well, it must be an array.

Of course it's an Array. And (unlike Lua) it is an Array with exactly
1 object in it. The fact that that object happens to be a member of
NilClass is no different than objects of TrueClass or Fixnum or yet
another Array.

[nil]     != []
[1,nil]   != [1]
[1,nil,2] != [1,2]

It's more than the fact that Ruby thinks they're different. They have
completely different, distinct, well-defined meanings.