From: "Wolfgang Nádasi-Donner" <ed.odanow@...>
Date: 2007-08-19T20:20:24+09:00
Subject: Re: Detecting duplicates in an array, anything in the standa

Thibaut Barrère wrote:
> Anything more elegant ?

No! :-)) - I tried it only using Arrays...

a = [1,2,3,4,5,4,2,2]
p a.inject([[],a[1..-1]]){|r,e|r[1].include?(e) ? [r[0]<<e, r[1][1..-1]] 
: [r[0], r[1][1..-1]]}[0].uniq # => [2, 4]
b = %w(a b c c)
p b.inject([[],b[1..-1]]){|r,e|r[1].include?(e) ? [r[0]<<e, r[1][1..-1]] 
: [r[0], r[1][1..-1]]}[0].uniq # => ["c"]

Wolfgang Nádasi-Donner
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