Class: Faker::ISBN

Inherits:
Object
  • Object
show all
Defined in:
lib/faker-isbn.rb,
lib/faker-isbn/version.rb

Constant Summary collapse

VERSION = 
"0.0.4"

Class Method Summary collapse

Class Method Details

.ten_digit ⇒ Object 



18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
 
# File 'lib/faker-isbn.rb', line 18

def self.ten_digit
  nine_digits = "0#{rand(10000000..99999999)}"
  multipliers = (2..10).to_a.reverse
  sum_of_products = [nine_digits.chars.map(&:to_i), multipliers].transpose.inject(0) { |memo, obj| memo += obj[0] * obj[1]; memo }
  remainder = sum_of_products % 11

  if (remainder == 0)
    tenth_digit = 0
  else
    tenth_digit = 11 - remainder
    tenth_digit = "X" if tenth_digit == 10
  end

  ten_digit = nine_digits << tenth_digit.to_s
  ten_digit
end

.thirteen_digit(rand_seed = rand(999_999_999)) ⇒ Object 



6
7
8
9
10
11
12
13
14
15
16
 
# File 'lib/faker-isbn.rb', line 6

def self.thirteen_digit(rand_seed=rand(999_999_999))
  isbn_13 = (978000000000+rand_seed).to_s

  isbn_array = Array.new
  isbn_13.split(//).each { |digit| isbn_array << digit.to_i }
  dot_product = [isbn_array, [1, 3, 1, 3, 1, 3, 1, 3, 1, 3, 1, 3]].transpose.inject(0) { |result, pair| result += pair[0]*pair[1]; result }
  check_digit = 10 - (dot_product % 10)
  check_digit = 0 if check_digit == 10
  isbn_13 << check_digit.to_s
  isbn_13
end