Sha256: 0a6e480b181ecb4ae9be8221249be75f2972af3e546cd72c23cb87ceb64c964f
Contents?: true
Size: 538 Bytes
Versions: 5
Compression:
Stored size: 538 Bytes
Contents
module BrDocuments class Gtin def initialize(code) @code = code end def valid? valid_length? && valid_checksum? end private def valid_length? [8, 12, 13, 14].include?(@code.length) end def valid_checksum? numbers = @code[0, @code.length - 1].chars.reverse odd = even = 0 numbers.each_with_index do |number, i| (i + 1).even? ? (even += number.to_i) : (odd += number.to_i * 3) end @code[-1].to_i == ((10 - (odd + even)) % 10) end end end
Version data entries
5 entries across 5 versions & 1 rubygems