You're building a Combine pipeline for a SwiftUI search screen that calls the API as the user types. What's the difference between putting switchToLatest() after map { query in api.search(query) } versus using flatMap, and why is switchToLatest the right choice for search?
switchToLatest cancels the previous inner Publisher when a new one arrives and subscribes only to the latest, so responses never arrive out of order. flatMap keeps every request running in parallel, so a late response can overwrite the latest results.
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