ConstVector::mapWithKey

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

Description

public function mapWithKey(
  callable $fn,
): ConstVector<Tu>

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

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

Parameters

  • callable $fn - The callback containing the operation to apply to the ConstVector keys and values.

Return Values

  • ConstVector<Tu> - a ConstVector containing the values after a user-specified operation on the current Vector's keys and values is applied.