MutableVector::mapWithKey

Returns a MutableVector containing the values after an operation has been applied to each key and value in the current MutableVector.

Description

public function mapWithKey(
  (function(int,Tv):Tu) $fn,
): MutableVector<Tu>

Returns a MutableVector containing the values after an operation has been applied to each key and value in the current MutableVector.

Every key and value in the current MutableVector is affected by a call to mapWithKey(), unlike filterWithKey() where only values that meet a certain criteria are affected.

Parameters

  • (function(int,Tv):Tu) $fn - The callback containing the operation to apply to the MutableVector keys and values.

Return Values