How about?

```js
function test() {
  for (var i = 0; i < concurrentAttempts; i++) {
    try {
      await data = fib(Math.random() * maxIterations);
      var [a, b, i] = data;
      console.log(`golden ratio for ${i} iterations: ${b / a} (last two values: ${a} ${b})`);
    } catch (err) {
      console.error(err);
    }
  }
}
```