Test.hx

package prezi.engine;

using Lambda;

class Test
{
  public static function main()
	{
		var doc = new Document();
		// Add some objects
		var transformeds:List<Object> = doc.getObjects(ClassUtils.implements(Transformed));
	}
}


class Document
{
	private var objects:Array<Object>;

	public function getObjects(criteria:Object->Bool):List<Object>
	{
		if (criteria == null)
		{
			return objects;
		}
		return objects.filter(criteria);
	}
}

class ClassUtils
{
	public static function implements(clazz:Class):Object->Bool
	{
		return function(object:Object):Bool
		{
			/// somehow determine if object implements clazz
			return ...;
		}
	}
}

class Object
{

}

interface Transformed
{

}

interface Styled
{

}