Async Patterns in Production
Production-grade async patterns beyond the basics. Error handling, concurrency control, streaming, and the patterns that separate junior code from senior code.
The floating promise trap, Error.cause chains, AggregateError, unhandled rejection tracking, and typed error patterns that make production async code bulletproof.
Master Promise.all, allSettled, race, and any in production. Parallel execution, dependent chains, combinator composition, and the patterns that make concurrent work reliable.
Exponential backoff with jitter, AbortSignal.timeout(), AbortSignal.any(), the circuit breaker pattern, and production retry strategies that handle transient failures gracefully.
The thundering herd problem, in-flight request deduplication, stale-while-revalidate from scratch, cache invalidation strategies, and how React Suspense integrates with async caching.
for-await-of, async generators, ReadableStream as async iterable, Server-Sent Events, streaming JSON parsing, and backpressure concepts for the browser.
Why you need concurrency control, the semaphore pattern, concurrent queues with max parallelism, priority queues for async tasks, and real-world patterns for upload queues and API batch processing.
10 progressively harder challenges testing your async mental model. Predict the output of complex promise chains, microtask ordering, error propagation, and async/await desugaring puzzles.