Concat

:::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. :::

public function concat<Tu super Tv>(
  Traversable<Tu> $traversable,
): Iterable<Tu>;

Parameters

• Traversable<Tu>$traversable

Returns

• Iterable<Tu>