class Mod11

Constants

VERSION
WEIGHT

Attributes

initial_value[RW]

Public Class Methods

new(initial_value) click to toggle source

# File lib/mod11.rb, line 10
def initialize(initial_value)
  @initial_value = initial_value
end

Public Instance Methods

check_digit() click to toggle source

# File lib/mod11.rb, line 18
def check_digit
  sum = 0

  initial_value.to_s.reverse.chars.each_with_index do |char, i|
    sum += char.to_i * WEIGHT[i]
  end

  remainder = sum % 11

  case remainder
  when 0 then remainder
  when 1 then nil
  else 11 - remainder
  end
end

full_value() click to toggle source

# File lib/mod11.rb, line 14
def full_value
  initial_value.to_s + check_digit.to_s
end