gistfile1.as

// the old, lame way

protected var _property:Property;

public function get property():Property
{
	if (!_property)
	{
		_property = new Property();
	}

	return _property;
}

gistfile2.as

// the new, hip way

protected var _property:Property;

public function get property():Property
{
	return _property ||= new Property();
}