Why is there no mapToInt() in the OptionalInt class?

Question

The IntStream class has map(), mapToObj(), mapToLong() and mapToDouble() methods, but those methods seem to be missing from the OptionalInt class.

Is there a good reason for those methods to be missing?

Answer 1

Rather obtusely you can do

OptionalInt oi = OptionalInt.of(1);
oi.ifPresent(i -> IntStream.of(i).map(j -> j + 1).forEach(System.out::println));

However it is not clear why OptionalInt doesn't have the same methods as IntStream although I note Optional has a subset of Stream