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chebyte/duplicate_elements.rb

Created November 28, 2011 18:28
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monkey patch for return duplicates elements from array
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duplicate_elements.rb
#monkey patch for duplicates
module Enumerable
def dups
inject({}) {|h,v| h[v]=h[v].to_i+1; h}.reject{|k,v| v==1}.keys
end
end
== Usage
[1, 2, 3, 3].dups
#[3]
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