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