From: "David A. Black" <dblack@...>
Date: 2007-08-21T20:45:05+09:00
Subject: Re: Detecting duplicates in an array, anything in the standa

Hi --

On Tue, 21 Aug 2007, Jimmy Kofler wrote:

> 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

It's buggy, though:

  >> [nil,1,2,2,3,nil].find_dups
  => [2]


David

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