Does Java 8 provide a good way to repeat a value or function?

Question

In many other languages, eg. Haskell, it is easy to repeat a value or function multiple times, eg. to get a list of 8 copies of the value 1:

take 8 (repeat 1         


        

Answer 1

For this specific example, you could do:

IntStream.rangeClosed(1, 8)
         .forEach(System.out::println);

If you need a step different from 1, you can use a mapping function, for example, for a step of 2:

IntStream.rangeClosed(1, 8)
         .map(i -> 2 * i - 1)
         .forEach(System.out::println);

Or build a custom iteration and limit the size of the iteration:

IntStream.iterate(1, i -> i + 2)
         .limit(8)
         .forEach(System.out::println);