concat

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 Iterable that is the concatenation of the values of the current KeyedIterable and the values of the provided Traversable

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

The values of the provided Traversable is concatenated to the end of the current KeyedIterable to produce the returned Iterable.

Guide

• Constraints

Parameters

• Traversable<Tu>$traversable - The Traversable to concatenate to the current KeyedIterable.

Returns

• Iterable<Tu> - The concatenated Iterable.