/**
* Returns intersection of given collection and current collection.
* Returned object is new.
*
* @param array|\stekycz\collections\ICollection $items
* @return \stekycz\collections\ArraySet
*/
public function intersect($items)
{
$items = Collections::toSet($items);
return Collections::toSet(array_intersect($this->items->toArray(), $items->toArray()));
}
