Chunk

:::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 a vec containing the original dict split into chunks of the given size

namespace HH\Lib\Dict;

function chunk<Tk as arraykey, Tv>(
  KeyedTraversable<Tk, Tv> $traversable,
  int $size,
): vec<dict<Tk, Tv>>;

If the original dict doesn't divide evenly, the final chunk will be smaller.

Time complexity: O(n) Space complexity: O(n)

Parameters

• KeyedTraversable<Tk,Tv> $traversable
• int $size

Returns

• vec<dict<Tk, Tv>>

Examples

$result = Dict\chunk(dict[1 => 2, 2 => 4], 1);
print_r($result);
// result: vec[dict[1=>2], dict[2=>4]]

$result = Dict\chunk(dict[], 1);
print_r($result);
//result: vec[]