From: Jimmy Kofler <koflerjim@...>
Date: 2007-08-21T17:01:37+09:00
Subject: Re: Detecting duplicates in an array, anything in the standa

Duplicates can also be extracted from an array like this:


class Array

  def find_dups
    uniq.map {|v| (self - [v]).size < (self.size - 1) ? v : nil}.compact
  end

end


(The faster, the better; http://snippets.dzone.com/posts/show/4148 )

Cheers,

j.k.
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