IntStream iterate in steps

Question

How do you iterate through a range of numbers (0-100) in steps(3) with IntStream?

I tried iterate, but this never stops executing.

IntS         


        

Answer 1

If you are ok adding a library dependency, the IntInterval class in Eclipse Collections has the step function I think you are looking for. I tried a few different approaches converting IntInterval to an IntStream, since the original question asked for IntStream. Here are the solutions I came up with using IntInterval and then converting it to an IntStream.

IntInterval interval = IntInterval.zeroTo(99).by(3);
interval.each(System.out::print);

IntStream.of(interval.toArray()).forEach(System.out::print);

IntStream.Builder builder = IntStream.builder();
interval.each(builder::add);
builder.build().forEach(System.out::print);

IntStream.generate(interval.intIterator()::next)
    .limit(interval.size()).forEach(System.out::print);

IntInterval is inclusive on the from and to like IntStream.rangeClosed().

Note: I am a committer for Eclipse Collections