MutableMap::filterWithKey
Returns a MutableMap containing the values of the current MutableMap
that meet a supplied condition applied to its keys and values
public function filterWithKey(
(function(Tk, Tv): bool) $fn,
): MutableMap<Tk, 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().
The keys associated with the current MutableMap remain unchanged in the
returned MutableMap; the keys will be used in the filtering process only.
Parameters
(function(Tk, Tv): bool) $fn- The callback containing the condition to apply to the currentMutableMapkeys and values.
Returns
MutableMap<Tk,Tv>- aMutableMapcontaining the values after a user-specified condition is applied to the keys and values of the currentMutableMap.