apple/swift-async-algorithms

Swift Async Algorithms is an open-source library from Apple that provides ready-made tools for working with streams of data that arrive over time in Swift apps. Swift is Apple's programming language for building iOS, macOS, and other Apple platform apps. The library sits on top of Swift's built-in async/await system, which is the modern way Swift apps handle tasks that take time to complete (like network requests or reading files) without freezing the app. The core idea is that many real-world data problems involve values that keep arriving in a sequence, not all at once. Things like sensor readings, user keystrokes, live search results, or incoming messages are all examples. This library gives developers pre-built, well-tested operations for working with those streams, similar to how standard programming languages provide tools for working with plain lists of items. The toolkit covers several categories. For combining multiple streams, there are tools like merge (interleave items from two streams into one), zip (pair up items from two streams), and combineLatest (react whenever any of several streams produces a new value). For timing, there are debounce (wait until a stream has been quiet for a moment before acting) and throttle (ensure you don't react more often than a minimum interval). There are also utilities for grouping items into chunks, removing duplicates, filtering out null values, and emitting timer ticks at regular intervals. The library is cross-platform, meaning it works on Apple devices and also on Linux where Swift is supported. It is distributed as a Swift package, so adding it to a project is a matter of referencing it in the project's dependency file. The project is developed in the open on GitHub with community discussion happening on the Swift Forums.