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741Suspension points and executor scheduling
742Sequential awaits versus concurrent work
743Async properties and asynchronous getters
744Calling async code from synchronous entry points
745Task initializer and inherited context
746Task.detached and explicit dependency capture
747Task handles and awaiting value
748Task priority inheritance and escalation
749Task-local values with @TaskLocal
750Task.yield for cooperative scheduling
751Task.sleep with Duration
752Cancellation propagation through task trees
753Task.checkCancellation in CPU loops
754withTaskCancellationHandler cleanup
755Cancellation-safe resource acquisition
756Async defer alternatives for cleanup
757Avoiding fire-and-forget task leaks
758Async main entry points
759Bridging completion handlers with checked continuations
760Resuming a continuation exactly once
761Unsafe continuations and their tradeoffs
762Continuation cancellation races
763Async let lifetime and implicit awaiting
764Async let error propagation
765Choosing tasks versus operation queues
766withTaskGroup for dynamically sized work
767withThrowingTaskGroup failure behavior
768Adding child tasks with addTaskUnlessCancelled
769Consuming task group results in completion order
770Bounded concurrency with task groups
771Discarding task groups for server workloads
772cancelAll does not stop uncooperative children
773Aggregating partial failures from child tasks
774Designing an AsyncSequence iterator
775AsyncIteratorProtocol.next and termination
776AsyncStream continuation lifecycle
777AsyncStream buffering policies
778AsyncStream onTermination cleanup
779AsyncThrowingStream error completion
780Adapting delegate callbacks into async streams
781Backpressure versus buffering in async pipelines
782AsyncAlgorithms AsyncChannel handoff
783Merging asynchronous sequences
784Combining latest asynchronous values
785Debouncing asynchronous input
786Throttling asynchronous event streams
787Chunking asynchronous elements
788Testing async sequence cancellation
789Single-consumer versus multicast streams
790Actor stored state and serialized access
791Actor reentrancy across suspension points
792Restoring invariants after await
793Actor methods with transactional state transitions
794nonisolated actor members
795Isolated actor parameters for batched operations
796Global actor declarations and usage
797MainActor.run versus main-actor tasks
798MainActor.assumeIsolated preconditions
799Actor initialization isolation rules
800Actor deinitialization constraints
801Cross-actor references and immutable state
802Distributed actor transport concepts
803Custom actor executors
804SerialExecutor implementation contracts
805Actor contention and throughput measurement
806Avoiding actor deadlocks from synchronous waits
807Actor-based image cache with request coalescing
808Actor-based token refresh deduplication
809Testing reentrant actor behavior
810Default actor isolation compiler settings
811Nonisolated async execution under different language modes
812Implicit Sendable synthesis for value types
813Checked Sendable classes and immutable storage
814Auditing @unchecked Sendable invariants
815Sendability of captured closure values
816Sendable versus thread-safe APIs
817Transferring disconnected regions with sending
818Task-isolated values and strong transfer diagnostics
819Isolated conformances and protocol requirements
820@preconcurrency imports during migration
821@preconcurrency on protocol conformances
822Migrating delegate callbacks across actor boundaries
823Bridging Objective-C APIs without isolation guarantees
824Sendable metatypes and generic constraints
825Avoiding shared mutable global variables
826Protecting shared state with Mutex.withLock
827Atomic memory ordering fundamentals
828Choosing mutexes versus actors
829Fixing main-actor-isolated default arguments
830Inferring isolation in SwiftUI view models
831Incremental strict concurrency adoption by target
832Concurrency sanitizer versus compiler diagnostics
833Documenting executor assumptions in public APIs
834Publisher output and failure associated types
835Subscriber demand negotiation
836Subscription request and cancel
837AnyCancellable storage ownership
838Just for a single immediate value
839Empty completion behavior
840Fail for immediate publisher errors
841Deferred for per-subscription work
842Future eagerness and result caching
843PassthroughSubject event delivery
844CurrentValueSubject state delivery
845Record for replaying test events
846Publishers.Sequence over finite inputs
847Timer.publish and autoconnect
848NotificationCenter publisher lifetimes
849KVO publishers for NSObject properties
850URLSession.DataTaskPublisher responses
851Custom Publisher implementation
852Custom Subscriber with finite demand
853Type erasure using eraseToAnyPublisher
854Connecting ConnectablePublisher manually
855Cancellable lifetimes in reusable UIKit cells
856Combine map versus tryMap
857Combine compactMap for optional outputs
858Combine filter versus tryFilter
859Combine scan for accumulated state
860Combine reduce waits for completion
861Combine collect with counts and time windows
862Combine flatMap concurrency limits
863Combine switchToLatest for search requests
864Combine merge for homogeneous events
865Combine zip for paired emissions
866Combine combineLatest emission requirements
867Combine append and prepend ordering
868Combine concatenate and delayed subscription
869Combine replaceNil and replaceEmpty
870Combine removeDuplicates custom predicates
871Combine prefix and prefix untilOutputFrom
872Combine dropFirst and drop untilOutputFrom
873Combine first and last matching elements
874Combine contains and allSatisfy
875Combine handleEvents for instrumentation
876Combine materialized event modeling
877Combining validation publishers into form state
878subscribe(on:) controls upstream subscription work
879receive(on:) controls downstream delivery
880Scheduler time and stride types
881RunLoop scheduler versus DispatchQueue scheduler
882ImmediateScheduler limitations
883Debounce timing in search publishers
884Throttle latest versus first behavior
885Delay versus timeout operators
886Timeout with a custom failure
887Catch switches to a recovery publisher
888Retry resubscribes to upstream
889Exponential backoff with Deferred publishers
890mapError for domain failures
891setFailureType for nonfailing publishers
892assertNoFailure and production crash risk
893share reference semantics and replay limitations
894multicast with explicit subject ownership
895buffer size and overflow strategies
896Avoiding feedback loops with @Published
897Published willSet emission timing
898assign(to:on:) retention behavior
899assign(to: &$property) subscription lifetime
900Bridging publishers with AsyncPublisher.values
901Preventing dropped events when bridging to async
902Deterministic scheduler tests for Combine

741Suspension points and executor scheduling
742Sequential awaits versus concurrent work
743Async properties and asynchronous getters
744Calling async code from synchronous entry points
745Task initializer and inherited context
746Task.detached and explicit dependency capture
747Task handles and awaiting value
748Task priority inheritance and escalation
749Task-local values with @TaskLocal
750Task.yield for cooperative scheduling
751Task.sleep with Duration
752Cancellation propagation through task trees
753Task.checkCancellation in CPU loops
754withTaskCancellationHandler cleanup
755Cancellation-safe resource acquisition
756Async defer alternatives for cleanup
757Avoiding fire-and-forget task leaks
758Async main entry points
759Bridging completion handlers with checked continuations
760Resuming a continuation exactly once
761Unsafe continuations and their tradeoffs
762Continuation cancellation races
763Async let lifetime and implicit awaiting
764Async let error propagation
765Choosing tasks versus operation queues
766withTaskGroup for dynamically sized work
767withThrowingTaskGroup failure behavior
768Adding child tasks with addTaskUnlessCancelled
769Consuming task group results in completion order
770Bounded concurrency with task groups
771Discarding task groups for server workloads
772cancelAll does not stop uncooperative children
773Aggregating partial failures from child tasks
774Designing an AsyncSequence iterator
775AsyncIteratorProtocol.next and termination
776AsyncStream continuation lifecycle
777AsyncStream buffering policies
778AsyncStream onTermination cleanup
779AsyncThrowingStream error completion
780Adapting delegate callbacks into async streams
781Backpressure versus buffering in async pipelines
782AsyncAlgorithms AsyncChannel handoff
783Merging asynchronous sequences
784Combining latest asynchronous values
785Debouncing asynchronous input
786Throttling asynchronous event streams
787Chunking asynchronous elements
788Testing async sequence cancellation
789Single-consumer versus multicast streams
790Actor stored state and serialized access
791Actor reentrancy across suspension points
792Restoring invariants after await
793Actor methods with transactional state transitions
794nonisolated actor members
795Isolated actor parameters for batched operations
796Global actor declarations and usage
797MainActor.run versus main-actor tasks
798MainActor.assumeIsolated preconditions
799Actor initialization isolation rules
800Actor deinitialization constraints
801Cross-actor references and immutable state
802Distributed actor transport concepts
803Custom actor executors
804SerialExecutor implementation contracts
805Actor contention and throughput measurement
806Avoiding actor deadlocks from synchronous waits
807Actor-based image cache with request coalescing
808Actor-based token refresh deduplication
809Testing reentrant actor behavior
810Default actor isolation compiler settings
811Nonisolated async execution under different language modes
812Implicit Sendable synthesis for value types
813Checked Sendable classes and immutable storage
814Auditing @unchecked Sendable invariants
815Sendability of captured closure values
816Sendable versus thread-safe APIs
817Transferring disconnected regions with sending
818Task-isolated values and strong transfer diagnostics
819Isolated conformances and protocol requirements
820@preconcurrency imports during migration
821@preconcurrency on protocol conformances
822Migrating delegate callbacks across actor boundaries
823Bridging Objective-C APIs without isolation guarantees
824Sendable metatypes and generic constraints
825Avoiding shared mutable global variables
826Protecting shared state with Mutex.withLock
827Atomic memory ordering fundamentals
828Choosing mutexes versus actors
829Fixing main-actor-isolated default arguments
830Inferring isolation in SwiftUI view models
831Incremental strict concurrency adoption by target
832Concurrency sanitizer versus compiler diagnostics
833Documenting executor assumptions in public APIs
834Publisher output and failure associated types
835Subscriber demand negotiation
836Subscription request and cancel
837AnyCancellable storage ownership
838Just for a single immediate value
839Empty completion behavior
840Fail for immediate publisher errors
841Deferred for per-subscription work
842Future eagerness and result caching
843PassthroughSubject event delivery
844CurrentValueSubject state delivery
845Record for replaying test events
846Publishers.Sequence over finite inputs
847Timer.publish and autoconnect
848NotificationCenter publisher lifetimes
849KVO publishers for NSObject properties
850URLSession.DataTaskPublisher responses
851Custom Publisher implementation
852Custom Subscriber with finite demand
853Type erasure using eraseToAnyPublisher
854Connecting ConnectablePublisher manually
855Cancellable lifetimes in reusable UIKit cells
856Combine map versus tryMap
857Combine compactMap for optional outputs
858Combine filter versus tryFilter
859Combine scan for accumulated state
860Combine reduce waits for completion
861Combine collect with counts and time windows
862Combine flatMap concurrency limits
863Combine switchToLatest for search requests
864Combine merge for homogeneous events
865Combine zip for paired emissions
866Combine combineLatest emission requirements
867Combine append and prepend ordering
868Combine concatenate and delayed subscription
869Combine replaceNil and replaceEmpty
870Combine removeDuplicates custom predicates
871Combine prefix and prefix untilOutputFrom
872Combine dropFirst and drop untilOutputFrom
873Combine first and last matching elements
874Combine contains and allSatisfy
875Combine handleEvents for instrumentation
876Combine materialized event modeling
877Combining validation publishers into form state
878subscribe(on:) controls upstream subscription work
879receive(on:) controls downstream delivery
880Scheduler time and stride types
881RunLoop scheduler versus DispatchQueue scheduler
882ImmediateScheduler limitations
883Debounce timing in search publishers
884Throttle latest versus first behavior
885Delay versus timeout operators
886Timeout with a custom failure
887Catch switches to a recovery publisher
888Retry resubscribes to upstream
889Exponential backoff with Deferred publishers
890mapError for domain failures
891setFailureType for nonfailing publishers
892assertNoFailure and production crash risk
893share reference semantics and replay limitations
894multicast with explicit subject ownership
895buffer size and overflow strategies
896Avoiding feedback loops with @Published
897Published willSet emission timing
898assign(to:on:) retention behavior
899assign(to: &$property) subscription lifetime
900Bridging publishers with AsyncPublisher.values
901Preventing dropped events when bridging to async
902Deterministic scheduler tests for Combine

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Lesson 839 of 2,511·10. Concurrency and Reactive SystemsFree lesson

Empty completion behavior

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