module VerificadorBoletoBr::Calculus::Module10
Public Instance Methods
modulo10(str)
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# File lib/verificador_boleto_br/calculus/module10.rb, line 4 def modulo10(str) str = str.chars.reverse i = 2 sum = 0 res = 0 str.each do |char| res = char.to_i * i sum += res > 9 ? (res - 9) : res i = i == 2 ? 1 : 2 end if (sum % 10) == 0 0 else 10 - (sum % 10) end end