Sha256: 4de364d974d91ebd051968e940f05e38394e3490089a2f81d4b1f185afcb8dfc
Contents?: true
Size: 578 Bytes
Versions: 14
Compression:
Stored size: 578 Bytes
Contents
# frozen_string_literal: true
class Valvat
module Checksum
class LT < Base
def check_digit
base_checksum = sum_with(0) % 11
shifted_checksum = sum_with(2) % 11
[base_checksum, shifted_checksum, 0].find { |checksum| checksum % 11 != 10 }
end
private
def sum_with(offset)
sum_figures_by do |digit, index|
multi_digit_multiplier = figures.size - index + offset
digit * (multi_digit_multiplier > 9 ? multi_digit_multiplier % 9 : multi_digit_multiplier)
end
end
end
end
end
Version data entries
14 entries across 14 versions & 1 rubygems