Class: Valabn::Utils

Inherits:
Object
  • Object
show all
Defined in:
lib/valabn/utils.rb

Class Method Summary collapse

Class Method Details

.valid_format?(number) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/valabn/utils.rb', line 3

def self.valid_format?(number)
  number = number.to_s.gsub(/\W/, '')

  if !!( number =~ /\A[0-9]{11}\z/)
    weights = [10, 1, 3, 5, 7, 9, 11, 13, 15, 17, 19]
    sum = 0

    numbers = number.split('').map(&:to_i)
    numbers[0] = numbers[0] - 1

    numbers = numbers.zip(weights).map { |x, y| x * y }
    sum = numbers.inject(0, :+)

    (sum % 89).zero?
  else
    false
  end
end