Sha256: d0ea3086b6da70f34a93de6c8b201e30f195ecead7505814e1fdd1fab957bc53
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Size: 432 Bytes
Versions: 21
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Contents
# == CreditCardValidations Luhn
# simple class to validate Luhn numbers.
#
# Luhn.valid? 4111111111111111
#
module CreditCardValidations
class Luhn
def self.valid?(number)
s1 = s2 = 0
number.to_s.reverse.chars.each_slice(2) do |odd, even|
s1 += odd.to_i
double = even.to_i * 2
double -= 9 if double >= 10
s2 += double
end
(s1 + s2) % 10 == 0
end
end
end
Version data entries
21 entries across 21 versions & 2 rubygems