HH\ImmSet::filterWithKey
Returns an ImmSet
containing the values of the current ImmSet
that
meet a supplied condition applied to its "keys" and values
public function filterWithKey(
(function(arraykey, Tv): bool) $callback,
): ImmSet<Tv>;
Since ImmSet
s don't have keys, the callback uses the values as the keys
as well.
Only values that meet a certain criteria are affected by a call to
filterWithKey()
, while all values are affected by a call to
mapWithKey()
.
Parameters
(function(arraykey, Tv): bool) $callback
- The callback containing the condition to apply to the currentImmSet
keys and values.
Returns
ImmSet<Tv>
- anImmSet
containing the values after a user-specified condition is applied to the values of the currentImmSet
.
Examples
See Set::filterWithKey
for usage examples.