code: public Optional<String> arg(final String name) {
  		int index = _args.indexOf("--" + name);
  		if (index == -1) index = _args.indexOf("-" + name);
  
  		return index >= 0 && index < _args.length() - 1
  			? Optional.of(_args.get(index + 1))
  			: Optional.empty();
  	}
docs: Return the parameter with the given name.
  
  @param name the parameter name
  @return the parameter with the given name, if any