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douo/chinese_id.rb

Last active September 27, 2018 17:48
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Chinese ID card number checksum
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chinese_id.rb
module ChineseId
WEIGHT = [7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2]
CODE = ["1", "0", "X", "9", "8", "7", "6", "5", "4", "3", "2"]
#S = Sum(Ai * Wi)
#Y = mod(S, 11)
#C = Cy
def self.checksum id
if "String" == id.class.name
number = id.split(//).map{|c| c.to_i}
else
number = id
end
sum = 0
number[0..16].zip(WEIGHT) do |x,y|
sum += x * y
end
y = sum % 11
CODE[y]
end
end
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