Async Request Coordination Patterns

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Your question is Async Request Coordination Patterns. Take a moment with it on the right.

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Problem

Explain how you would coordinate asynchronous data fetching so multiple requests can run safely, duplicate fetches are avoided, and the UI only applies the correct result when responses arrive out of order.

What This Tests

Using a queue to control pending and active work
Using a hash map to deduplicate in-flight requests
Managing ordered UI updates when responses complete out of order
Reasoning about caching, retries, and cancellation

Strong Answer Signals

Mentions bounded concurrency

Explains request identity keys

Prevents stale responses from overwriting fresh state

Separates fetch state from render state