AsyncSequence
An asynchronous sequence protocol in Swift's concurrency model that allows developers to iterate over data sequences in an asynchronous manner. It is commonly used for handling streaming data or paginated API responses.
Timeline (last 90 days)
AsyncSequence is a protocol introduced alongside the structured concurrency model in Swift 5.5, and is the asynchronous counterpart of the synchronous Sequence.
After encapsulating pagination as an AsyncSequence, developers can traverse all data with a single for await loop, with the underlying page-turning logic transparent to the upper layer.
AsyncSequence natively supports backpressure—only after the previous element has been processed will the next asynchronous fetch be triggered—avoiding the memory pressure caused by preloading all data in pagination scenarios.
Compared to Combine framework's Publisher, AsyncSequence does not depend on the reactive programming paradigm, has a lower learning curve, and integrates more naturally with Swift's structured concurrency.
All Facts (4)
AsyncSequence is a protocol introduced alongside the structured concurrency model in Swift 5.5, and is the asynchronous counterpart of the synchronous Sequence.
50%UnverifiedAfter encapsulating pagination as an AsyncSequence, developers can traverse all data with a single for await loop, with the underlying page-turning logic transparent to the upper layer.
50%UnverifiedAsyncSequence natively supports backpressure—only after the previous element has been processed will the next asynchronous fetch be triggered—avoiding the memory pressure caused by preloading all data in pagination scenarios.
50%UnverifiedCompared to Combine framework's Publisher, AsyncSequence does not depend on the reactive programming paradigm, has a lower learning curve, and integrates more naturally with Swift's structured concurrency.
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