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iNecas/find_duplicities.rb

Created February 21, 2011 12:44
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finding duplicities in array in one line
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find_duplicities.rb
comps = ["PC", "MAC", "PC", "PC", "LINUX", "MAC", "DIDAKTIK"]
duplicities = comps.group_by{|x| x.first}.find_all{|k,v| v.size > 1}.map{|x| x.first}
duplicities # => ["MAC","PC"]
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