index.js

function* gen(i) {
    yield {o: i, n: ++i};
    yield {o: i, n: ++i};
    yield {o: i, n: ++i};
}

let g = gen(3);

for (let {o, n} of g) {
    console.log(o, n);
    -> 3, 4
    -> 4, 5
    -> 5, 6
}