A simple class containing protected variables, getters and setters, and optional arguments.

Foo.as

public class Foo extends Object
{
  // Variables
	protected var _bar:String;

	/** Contains a user-set string or "foo". Will never be blank. */
	public function get bar():String { return _bar; }
	public function set bar(value:String)
	{
		if (value != "")
		{
			_bar = value;
		}
		else
		{
			_bar = "foo";
		}
	}

	/** Constructor */
	public function Foo(s:String = "foo")
	{
		_bar = s;
	}

	/**
	 * Appends a string to the Foo's bar and returns the new string.
	 * @param	s The string to append to the Foo's bar.
	 * @return	A new string containing the Foo's bar and s.
	 */
	public function appendString(s:String):String
	{
		var appendedString:String;
		appendedString = _bar + s;
		return appendedString;
	}
}