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/gist:4349183

Created December 20, 2012 22:35
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gistfile1.rb
l = [{"a" => 1, "b" => 2}, {"a" => 5, "b" => 8}]
k = %w(a b)
sums = k.map do |key|
[key, l.inject(0) {|memo, hash| memo + hash[key]}]
end
Hash[sums]
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