Luhn algorithm

Luhn.rb

def sum_digits digit
  if digit < 10
    digit
  else
    (digit % 10) + (digit / 10).to_f
  end
end

def validate number
  number = number.to_s.reverse.to_i
  digit_in_number = number.to_s.split('')
  even_digit_in_number, final_digit_list = [], []

  digit_in_number.each_with_index do |v, i|
    if (i % 2) == 0
      even_digit_in_number << v.to_i
    else
      even_digit_in_number << v.to_i*2
    end
  end
  even_digit_in_number.each do |d|
    final_digit_list << sum_digits(d)
  end
  final_digit_list.sum % 10 == 0
end


puts validate 4561261212345467
# => true