OptionParser::Switch::OptionalArgument

Class

Switch that can omit argument.

Instance Methods

parse(arg, argv, &error)

          
            # File tmp/rubies/ruby-2.4.10/lib/optparse.rb, line 688
def parse(arg, argv, &error)
  if arg
    conv_arg(*parse_arg(arg, &error))
  else
    conv_arg(arg)
  end
end

Parses argument if given, or uses default value.