From: Bertram Scharpf <lists@...>
Date: 2009-08-04T22:57:58+09:00
Subject: Re: Inconsistency in Array#[]

Hi,

Am Dienstag, 04. Aug 2009, 21:59:21 +0900 schrieb Brian Candler:
> Maybe there's a case for something that you can rely on being present at 
> the Object level:
> 
>   class Object; def true?; true; end; end
>   class NilClass; def true?; false; end; end
>   class FalseClass; def true?; false; end; end
>   class String; def true?; !empty?; end; end
>   class Array; def true?; !empty?; end; end
>   class Numeric; def true?; !zero?; end; end

Again: I use it for default values. Here's an example.

  class Array ; def notempty? ; self if any? ; end ; end

  def halign list
    ...
  end

  halign lines.notempty? || %w{(no entries)}

Another name for any? doesn't help here.


Bertram


-- 
Bertram Scharpf
Stuttgart, Deutschland/Germany
http://www.bertram-scharpf.de