/**
* Returns the set of values that are in this set, excluding the values that
* are also in the other set.
*
* @param Api\Set|Iterator|array $set
*
* @return Api\Set
*/
public function difference($set)
{
$differenceSet = new Set();
foreach ($this as $value) {
if ($set->has($value)) {
$differenceSet->add($value);
}
}
return $differenceSet;
}
