HH\ImmSet::map
Returns an ImmSet
containing the values after an operation has been
applied to each value in the current ImmSet
public function map<Tu as arraykey>(
(function(Tv): Tu) $callback,
): ImmSet<Tu>;
Every value in the current ImmSet
is affected by a call to map()
,
unlike filter()
where only values that meet a certain criteria are
affected.
Guide
Parameters
(function(Tv): Tu) $callback
- The callback containing the operation to apply to the currentImmSet
values.
Returns
ImmSet<Tu>
- aImmSet
containing the values after a user-specified operation is applied.
Examples
See Set::map
for usage examples.