From: Maurizio De Santis <desantis.maurizio@...>
Date: 2010-08-01T18:02:32+09:00
Subject: Re: what is the correct way to extend native methods?

James Harrison wrote:
>>    return self.select{ |val| val.to_s =~ args[0] } if args.size == 1
>> and args[0].is_a?(RegExp)
> 
> Try Regexp, not RegExp
> 
> http://ruby-doc.org/core/classes/Regexp.html

LOL that's what I obtain when I'm still not asleep at 3.00 am :P

But now it's morning, and I have still a problem; please consider this:


class Array

  def slice_with_regexp(*args)
    return self.select{ |val| val =~ args[0] } if args.size == 1 and 
args[0].is_a?(Regexp)
    slice_without_regexp(*args)
  end

  alias_method :slice_without_regexp, :slice
  alias_method :slice_without_regexp, :[]
  alias_method :slice, :slice_with_regexp

end

arr = %w[a b c ab]
puts arr.slice(/a/).inspect # => ["a", "ab"] slice with Regexp works; 
correct
puts arr.slice(1).inspect # => "b" original slice still works; correct
puts arr[/a/].inspect # => stack level too deep ???

why??
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