Sha256: 66f73fdddebbaf3e2a66b67dfb13eca03ac4c1ebe862c64d64bb72b3e39027af
Contents?: true
Size: 637 Bytes
Versions: 154
Compression:
Stored size: 637 Bytes
Contents
class Luhn
def self.create(number)
test_number = number * 10
luhn = Luhn.new(test_number)
return test_number if luhn.valid?
test_number + 10 - (luhn.checksum % 10)
end
attr_reader :number
def initialize(number)
@number = number
end
def addends
numbers = []
number.to_s.reverse.split('').map(&:to_i).each_with_index do |n, i|
if i % 2 == 0
numbers << n
else
value = n * 2
value -= 9 if value > 9
numbers << value
end
end
numbers.reverse
end
def checksum
addends.inject(0, :+)
end
def valid?
checksum % 10 == 0
end
end
Version data entries
154 entries across 154 versions & 1 rubygems