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Contents
module LuhnChecker
# This method implements Luhn algorythm.
# Details about it's work may be founded here: http://en.wikipedia.org/wiki/Luhn_Algorithm
def self.valid?(s)
value = s.gsub(/\D/, '').reverse
sum = i = 0
value.each_char do |ch|
n = ch.to_i
n *= 2 if i.odd?
n = 1 + (n - 10) if n >= 10
sum += n
i += 1
end
(sum % 10).zero?
end
end
Version data entries
14 entries across 14 versions & 1 rubygems