HH\ImmSet::mapWithKey
Returns an ImmSet
containing the values after an operation has been
applied to each "key" and value in the current ImmSet
public function mapWithKey<Tu as arraykey>(
(function(arraykey, Tv): Tu) $callback,
): ImmSet<Tu>;
Since ImmSet
s don't have keys, the callback uses the values as the keys
as well.
Every value in the current ImmSet
is affected by a call to
mapWithKey()
, unlike filterWithKey()
where only values that meet a
certain criteria are affected.
Parameters
(function(arraykey, Tv): Tu) $callback
- The callback containing the operation to apply to the currentImmSet
keys and values.
Returns
ImmSet<Tu>
- anImmSet
containing the values after a user-specified operation on the currentImmSet
's values is applied.
Examples
See Set::mapWithKey
for usage examples.