Class: Cdigits::Luhn::Store

Inherits:
Object
  • Object
show all
Defined in:
lib/cdigits/luhn/store.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(modulus:, digits: nil) ⇒ Store

Returns a new instance of Store.

Parameters:

  • modulus (Integer)
  • digits (Array<Integer>) (defaults to: nil) —

    initial digits (default [])


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# File 'lib/cdigits/luhn/store.rb', line 13

def initialize(modulus:, digits: nil)
  @modulus = modulus
  @digits = digits || []
  @position = nil
end

Instance Attribute Details

#digits ⇒ Array<Integer> (readonly)

Returns:

  • (Array<Integer>) 

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# File 'lib/cdigits/luhn/store.rb', line 9

def digits
  @digits
end

Instance Method Details

#append(value) ⇒ Integer

Append passed value to digits array

Parameters:

  • value (Integer)

Returns:

  • (Integer) —

    appended value


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# File 'lib/cdigits/luhn/store.rb', line 49

def append(value)
  @digits << value
  value
end

#append_non_zero_number ⇒ Integer

Append random non-zero number to digits array

Returns:

  • (Integer) —

    appended value


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# File 'lib/cdigits/luhn/store.rb', line 36

def append_non_zero_number
  append random_number(@modulus - 1) + 1
end

#append_number ⇒ Integer

Append random number to digits array

Returns:

  • (Integer) —

    appended value


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# File 'lib/cdigits/luhn/store.rb', line 42

def append_number
  append random_number(@modulus)
end

#fill_check_digit ⇒ Integer

Calculate check digit and fill its value into the check digit position

Returns:

  • (Integer) —

    check digit


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# File 'lib/cdigits/luhn/store.rb', line 27

def fill_check_digit
  return unless @position

  odd = (@digits.size - @position).odd?
  @digits[@position] = calculate_check_digit(sum, odd)
end

#initialize_check_digit ⇒ Object

Set check digit position


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# File 'lib/cdigits/luhn/store.rb', line 20

def initialize_check_digit
  @position = @digits.size
  append 0
end

#sum ⇒ Integer

sum of digits

Returns:

  • (Integer) 

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# File 'lib/cdigits/luhn/store.rb', line 56

def sum
  digits.reverse.each_with_index.inject(0) do |sum, (value, i)|
    value = double(value) if (i + 1).even?
    sum + value
  end
end