class Valvat::Checksum::DE
Constants
- M
- N
Public Instance Methods
check_digit()
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# File lib/valvat/checksum/de.rb, line 9 def check_digit prod = M figures.each do |fig| sum = (prod + fig).modulo(M) sum = M if sum.zero? prod = (2 * sum).modulo(N) end chk = N - prod chk == 10 ? 0 : chk end