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DifferenceByKey

hphp/hack/manual/apis/Classes/HH/ImmMap/differenceByKey.md

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:::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 new ImmMap with the keys that are in the current ImmMap, but not in the provided KeyedTraversable

Hack
public function differenceByKey(
  KeyedTraversable<mixed, mixed> $traversable,
): ImmMap<Tk, Tv>;

Parameters

Returns

Examples

See Map::differenceByKey for usage examples.

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