From: Brian Candler <b.candler@...>
Date: 2009-01-14T18:47:27+09:00
Subject: Re: Returning a duplicate from an Array

This version does only a single pass through the array:

  def dups(ary)
    seen = {}
    ary.find_all { |x| seen[x] || (seen[x]=true; false) }
  end

  p dups([1,2,3,1,4,5,6,3])
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