Date: Tue, 25 Mar 2025 00:02:18 +0100
Subject: [PATCH 67/67] minor fixes
---
.../04-promise-all-failure/solution.md | 29 +++++++++++++++++--
1 file changed, 27 insertions(+), 2 deletions(-)
diff --git a/1-js/11-async/08-async-await/04-promise-all-failure/solution.md b/1-js/11-async/08-async-await/04-promise-all-failure/solution.md
index 5689432d2..9fda8e000 100644
--- a/1-js/11-async/08-async-await/04-promise-all-failure/solution.md
+++ b/1-js/11-async/08-async-await/04-promise-all-failure/solution.md
@@ -82,7 +82,32 @@ function customPromiseAllWait(promises) {
Now `await customPromiseAllWait(...)` will stall the execution until all queries are processed.
-This is a more reliable approach.
+This is a more reliable approach, as it guarantees a predictable execution flow.
-Lastly, if we'd like to know about all the errors, e.g. for logging purposes, we can use `Promise.allSettled`.
+Lastly, if we'd like to process all errors, we can use either use `Promise.allSettled` or write a wrapper around it to gathers all errors in a single [AggregateError](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/AggregateError) object and rejects with it.
+```js
+// wait for all promises to settle
+// return results if no errors
+// throw AggregateError with all errors if any
+function allOrAggregateError(promises) {
+ return Promise.allSettled(promises).then(results => {
+ const errors = [];
+ const values = [];
+
+ results.forEach((res, i) => {
+ if (res.status === 'fulfilled') {
+ values[i] = res.value;
+ } else {
+ errors.push(res.reason);
+ }
+ });
+
+ if (errors.length > 0) {
+ throw new AggregateError(errors, 'One or more promises failed');
+ }
+
+ return values;
+ });
+}
+```
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