ToImmSet

:::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. :::

Returns an immutable set (ImmSet) based on the values of the current Vector

public function toImmSet(): ImmSet<Tv>;

Returns

• ImmSet<Tv> - An ImmSet containing the unique values of the current Vector.

Examples

This example shows that converting a Vector to an ImmSet also removes duplicate values:

// This Vector contains repetitions of 'red' and 'blue'
$v = Vector {'red', 'green', 'red', 'blue', 'red', 'yellow', 'blue'};

$imm_set = $v->toImmSet();

\var_dump($imm_set is \HH\ImmSet<_>);
\var_dump($imm_set);