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gr33n7007h/drn.rb

Created April 16, 2016 00:03
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Decode Roman Numerals.
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drn.rb
numeral_map = %w[M D C L X V I].zip([1000, 500, 100, 50, 10, 5, 1]).to_h
"MMXVI".chars.map { |c| numeral_map.fetch(c, 0) }.inject { |x, y| x < y ? -x + y : x + y } #=> 2016
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