javascript / intermediate
Snippet
Robust Async Control with Promise.allSettled
Unlike Promise.all, Promise.allSettled waits for all promises to finish (either fulfilled or rejected), allowing you to handle partial successes in a batch of operations.
snippet.js
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async function fetchData(urls) {const promises = urls.map(url => fetch(url));const results = await Promise.allSettled(promises);results.forEach((result, index) => {if (result.status === 'fulfilled') {console.log(`Success ${urls[index]}:`, result.value);} else {console.error(`Error ${urls[index]}:`, result.reason);}});}
Breakdown
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await Promise.allSettled(promises);
Waits for all async operations regardless of whether they succeed or fail.
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result.status === 'fulfilled'
Inspects each result to determine the outcome of that specific operation.