# Promises and async patterns
URL: https://wwadd.dev/moves/javascript/promises

Run independent work in parallel with `Promise.all`. Use `allSettled` when one failure shouldn't kill the batch, and `race`/`AbortController` for timeouts.


```javascript
// parallel — fails fast
const [user, posts] = await Promise.all([getUser(1), getPosts(1)]);

// parallel — collect successes and failures
const results = await Promise.allSettled([a(), b()]);
const ok = results.filter((r) => r.status === "fulfilled");

// timeout
const ctrl = new AbortController();
setTimeout(() => ctrl.abort(), 5000);
await fetch("/slow", { signal: ctrl.signal });
```

## Related Moves
- [fetch JSON with error handling](https://wwadd.dev/moves/javascript/fetch-json)
- [Array methods you reach for](https://wwadd.dev/moves/javascript/array-methods)