Lets judge Which is better...

Program Switch

class Carpark
  def initialize(arguments)
   @program_mode = {true => Interactive,false => Filemode}[arguments].new
  end
end
arg_params = ARGV.empty?
carpark = Carpark.new(arg_params)


V.S (versus)


class Carpark
 def initialize(mode)
   @mode = mode
 end
end

class CommandLineParser
 def initialize(arguments)
   @arguments = arguments
 end

 def build_input_mode
   arguments.empty? ? Interactive.new : Filemode.new
 end
end

Carpark.new(CommandLineParser.new(ARGV).build_input_mode)