Returns a MutableVector containing the values of the current MutableVector that meet a supplied condition applied to its keys and values

public function filterWithKey(
  (function(int, Tv): bool) $fn,
): MutableVector<Tv>;

Only keys and values that meet a certain criteria are affected by a call to filterWithKey(), while all values are affected by a call to mapWithKey().


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