Data Fetching and Client Patterns Questions

Client side patterns for fetching and managing remote data in user facing applications. Coverage includes fetch versus library choices, handling loading and error states, request cancellation and abort controllers, concurrent requests and coordination, caching strategies, stale while revalidate and memoization, debouncing and throttling API calls, handling side effects in component lifecycles or hooks, use of observables or reactive streams for data flows, testing network interactions, and UX considerations for progressive loading and retries. Interviewers evaluate practical techniques to reliably fetch, display, cache and update remote data in front end and mobile clients.