1
function* fibonacci() {
2
    let [prev, curr] = [0, 1];
3
    for (;;) {
4
      yield curr;
5
      [prev, curr] = [curr, prev + curr];
6
    }
7
  }
8

9
  for (let n of fibonacci()) {
10
    if (n > 10000) break;
11
    console.log(n);
12
  }