Reserve shared inventory without overbooking
Serialize a check-and-mutate operation and explain why protecting only the write is not enough.
SwiftConcurrencyGCD
Swift exercises
Practice Swift by writing code
Open an exercise, edit the starter code, and run it on the server. Each drill ties back to interview topics—concurrency, collections, debugging, and more.
Tags
Build a deterministic CI triage list
Filter noisy build records, sort the survivors by severity, and format stable output for reviewers.
SwiftCollections
Separate user-facing and debug descriptions
Make debugPrint useful for diagnosis while redacting sensitive values consistently.
SwiftDebugging
Aggregate server errors by endpoint
Build a dictionary from raw API events, then report required endpoints even when some have no failures.
SwiftCollections
Merge tag suggestions without losing priority
Normalize duplicate tag candidates, keep the strongest score per tag, and render a deterministic ranking.
SwiftCollections
Verify queue execution versus thread identity
Run a small script that shows why being on a dispatch queue is not the same thing as being off the main thread.
SwiftConcurrencyGCD
Predict method dispatch through a protocol type
Practice identifying when Swift uses dynamic dispatch for protocol requirements and when protocol extension methods are resolved statically.
SwiftProtocols