class Vindetta::Calculator
Constants
- InvalidCharacterError
Public Class Methods
check_digit(vin)
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# File lib/vindetta/calculator.rb, line 7 def self.check_digit(vin) transliterator = lambda do |c| index = "0123456789.ABCDEFGH..JKLMN.P.R..STUVWXYZ".chars.index(c) raise InvalidCharacterError if index.nil? index % 10 end summer = lambda do |sum, (a, b)| sum + (a * b) end sum = vin .chars .map(&transliterator) .zip([8, 7, 6, 5, 4, 3, 2, 10, 0, 9, 8, 7, 6, 5, 4, 3, 2]) .reduce(0, &summer) "0123456789X"[sum % 11] end