Module: CreditCardGenerator

Defined in:
lib/credit_card_generator/version.rb,
lib/credit_card_generator.rb

Overview

lib/credit_card_generator/version.rb

Constant Summary collapse

VERSION = 
"0.2.0"

Class Method Summary collapse

Class Method Details

.generate(prefix, length, quantity) ⇒ Object 



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# File 'lib/credit_card_generator.rb', line 28

def self.generate(prefix, length, quantity)
  (1..quantity).map { generate_card_number(prefix, length) }
end

.generate_card_number(prefix, length) ⇒ Object 



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# File 'lib/credit_card_generator.rb', line 17

def self.generate_card_number(prefix, length)
  card_number = prefix.dup

  while card_number.length < (length - 1)
    card_number += rand(0..9).to_s
  end

  checksum_digit = (10 - luhn_checksum(card_number + '0')) % 10
  card_number + checksum_digit.to_s
end

.luhn_checksum(card_number) ⇒ Object 



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# File 'lib/credit_card_generator.rb', line 2

def self.luhn_checksum(card_number)
  digits = card_number.chars.map(&:to_i)
  checksum = 0

  digits.reverse.each_with_index do |digit, index|
    if index.odd?
      digit *= 2
      digit -= 9 if digit > 9
    end
    checksum += digit
  end

  checksum % 10
end