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DocumentationHackReferenceInterfaceConstVectormapWithKey

ConstVector::mapWithKey

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

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

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

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

Returns

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