HH\ImmSet::zip

Throws an exception unless the current ImmSet or the Traversable is empty

public function zip<Tu>(
  Traversable<Tu> $traversable,
): ImmSet<HH\nothing>;

Since ImmSets only support integers or strings as values, we cannot have a Pair as an ImmSet value. So in order to avoid an InvalidArgumentException, either the current ImmSet or the Traversable must be empty so that we actually return an empty ImmSet.

Parameters

• Traversable<Tu>$traversable - The Traversable to use to combine with the elements of the current ImmSet.

Returns

• ImmSet<HH\nothing> - The ImmSet that combines the values of the current ImmSet with the provided Traversable; one of these must be empty or an exception is thrown.

Examples

See [Set::zip](</hack/reference/class/Set/zip/#examples>) for usage examples.