Create a infinite fibbonachi list.

infinite-fibonnachi.js

function* fib() {
  let a = 1, b = 0;
  for (; ;) {
    [a, b] = [b, a + b];
    yield b;
  }
}

const f = fib();
for (let i = 0; i < 6; i++)
  console.info(f.next().value)