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Contents
module BankTools
module SE
module Utils
# Based on http://blog.internautdesign.com/2007/4/18/ruby-luhn-check-aka-mod-10-formula
def self.valid_luhn?(number)
digits = number.to_s.scan(/\d/).reverse.map { |x| x.to_i }
digits = digits.each_with_index.map { |d, i|
d *= 2 if i.odd?
d > 9 ? d - 9 : d
}
sum = digits.inject(0) { |m, x| m + x }
sum % 10 == 0
end
def self.luhn_checksum(number)
digits = number.to_s.scan(/\d/).reverse.map { |x| x.to_i }
digits = digits.each_with_index.map { |d, i|
d *= 2 if i.even?
d > 9 ? d - 9 : d
}
sum = digits.inject(0) { |m, x| m + x }
mod = 10 - sum % 10
mod == 10 ? 0 : mod
end
end
end
end
Version data entries
21 entries across 21 versions & 1 rubygems