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akshaymohite/luhn-algorithm-to-validate-card-number.rb

Last active October 10, 2019 22:14
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Luhn's Algorithm to validate card numbers
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luhn-algorithm-to-validate-card-number.rb
number = "314143525252"
sum = 0
number.reverse.split("").each_slice(2) do |x,y|
sum += x.to_i + (2*y.to_i).divmod(10).sum
end
p sum%10 == 0 ? 'valid card number' : 'invalid card number'
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