RemoveAll

:::info[Note] This is a point-in-time snapshot of the API documentation from January 2026. Going forward, we will not be maintaining a public copy of these references, and recommend users to refer to the built-in signature helpers available in the Hack LSP instead for complete and up-to-date information. :::

Removes the values in the current Set that are also in the Traversable

public function removeAll(
  Traversable<Tv> $iterable,
): Set<Tv>;

If a value in the Traversable doesn't exist in the current Set, that value in the Traversable is ignored.

Future changes made to the current Set ARE reflected in the returned Set, and vice-versa.

Parameters

• Traversable<Tv>$iterable

Returns

• Set<Tv> - Returns itself.

Examples

This example removes multiple values from a Set and shows that the list of values to be removed can contain duplicates:

$s = Set {'red', 'green', 'blue', 'yellow'};

$s->removeAll(Vector {
  'red',
  'blue',
  'red',
});

\var_dump($s);