LastValue

:::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 the last value in the current Set

public function lastValue(): ?Tv;

Returns

• ?Tv - The last value in the current Set, or null if the current Set is empty.

Examples

This example shows how lastValue() can be used even when a Set may be empty:

$s = Set {'red', 'green', 'blue', 'yellow'};
\var_dump($s->lastValue());

$s = Set {};
\var_dump($s->lastValue());