HH\Vector::mapWithKey

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

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

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

Parameters

• (function(int,Tv):Tu) $callback - The callback containing the operation to apply to the current Vector's key/value pairs.

Return Values

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