def method_missing mtd, *args
      if mtd.to_s.chars.to_a.last == '='
        raise ArgumentError, "Invalid number of arguments (#{args.length} for 1)" if args.length != 1
        attributes[mtd.to_s.slice(0,mtd.to_s.length-1)] = args.first
      else
        raise ArgumentError, "Invalid number of arguments (#{args.length} for 0)" if args.length != 0
        attributes[mtd.to_s]
      end
    end
def method_missing mtd, *args
      if mtd.to_s.chars.to_a.last == '='
        raise ArgumentError, "Invalid number of arguments (#{args.length} for 1)" if args.length != 1
        attributes[mtd.to_s.slice(0,mtd.to_s.length-1)] = args.first
      else
        raise ArgumentError, "Invalid number of arguments (#{args.length} for 0)" if args.length != 0
        attributes[mtd.to_s]
      end
    end
Allows method-style access to the attributes.