RxJS5 emit array items over time and repeat forever

Question

I want to emit array items over time (a one second interval between each emit) and when all items have been emitted, repeat over and over.

I know how to do this, but

Answer 1

zip is the go-to operator here, but using Observable.from dumps all values on subscribe, and requires zip to keep a copy of the values. This isn't ideal for large arrays. The original IEnumerable overload for zip is implemented as zipIterable.

const MY_ARRAY = ['one','two','three'];
Rx.Observable.interval(1000).zipIterable(MY_ARRAY, (_, v) => v).subscribe(v => console.log(v))