HH\ImmVector::mapWithKey

Returns an ImmVector containing the results of applying an operation to each key/value pair in the current ImmVector

public function mapWithKey<Tu>(
  (function(int, Tv): Tu) $callback,
): ImmVector<Tu>;

mapWithKey()'s result contains a value for every key/value pair in the current ImmVector; unlike filterWithKey(), where only values whose key/value pairs meet a certain criterion are included in the resulting ImmVector.

Parameters

• (function(int, Tv): Tu) $callback

Returns

• ImmVector<Tu> - An ImmVector containing the results of applying a user-specified operation to each key/value pair of the current ImmVector in turn.

Examples

See [Vector::mapWithKey](</hack/reference/class/Vector/mapWithKey/#examples>) for usage examples.