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Alfreddd/find_dups.rb

Created November 23, 2011 10:16
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Find duplicates in Array
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find_dups.rb
# http://snippets.dzone.com/posts/show/4148
class Array
def find_dups
inject(Hash.new(0)) { |h,e| h[e] += 1; h }.select { |k,v| v > 1 }.collect { |x| x.first }
end
end
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