itspriddle · April 14, 2009 22:10
diff --git a/gistfile1.rb b/gistfile1.rb
  def valid_card?(num)
    odd = true
    num.to_s.gsub(/\D/,'').reverse.split('').map(&:to_i).collect { |d|
      d *= 2 if odd = !odd
      d > 9 ? d - 9 : d
    }.sum % 10 == 0
  end
	def valid_card?(num)
	odd = true
	num.to_s.gsub(/\D/,'').reverse.split('').map(&:to_i).collect { \|d\|
	d *= 2 if odd = !odd
	d > 9 ? d - 9 : d
	}.sum % 10 == 0
	end