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.


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

Return Values