From: William Fisk <william.fisk@...>
Date: 2006-10-29T03:54:52+09:00
Subject: Re: how to get only the duplicatet items from an array

another possibility:

>> a=['a','b',7,77,'a','ba',3,7]
=> ["a", "b", 7, 77, "a", "ba", 3, 7]
>> a.inject(Hash.new(0)){|h,v|h[v]+=1;h}.reject{|k,v| v<2}.keys
=> ["a", 7]

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