Hey everyone 👋 I am trying to write a "circular" iterator that works like so:

val it = (1..3).circularIterator()
it.next() // 1
it.next() // 2
it.next() // 3
it.next() // 1
// and so on...

Any ideas how I can accomplish this? Is there already something similar in the stdlib?

fun <R> Iterable<R>.circularIterator(): Iterator<R> {
    return iterator { 
        while (true) {
            yieldAll(this@circularIterator)
        }
    }
}

Comes to mind

Nice! Works like a charm, thank you!

A

Sequence

would allow you to further perform operations on the data (such as

filter

,

map

, etc.) and also allow iterating it multiple times.

That makes sense, thanks for the clarification!