Contents

module Credy

  class Check

    def self.luhn(code)
      s1 = s2 = 0
      code.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

1 entries across 1 versions & 1 rubygems

Version	Path
credy-0.1.1	lib/credy/check.rb