javascript / expert
Snippet
Strategic Error Aggregation in Batch Processing
AggregateError provides a native way to wrap multiple errors into a single object. In complex Node.js microservices, this allows a batch operation to attempt all sub-tasks and report every failure at once, rather than stopping at the first error, which is crucial for data consistency and debugging distributed systems.
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async function processBatch(tasks) {const results = await Promise.allSettled(tasks.map(t => t()));const failures = results.filter(r => r.status === 'rejected').map(r => r.reason);if (failures.length > 0) {throw new AggregateError(failures, 'Batch processing encountered errors');}}try {await processBatch(myTasks);} catch (e) {if (e instanceof AggregateError) {for (const error of e.errors) console.error(error.message);}}
nodejs
Breakdown
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throw new AggregateError(failures, '...');
Throws a single error containing an array of multiple underlying errors.
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for (const error of e.errors)
Iterates through all individual errors captured in the aggregate.