performing one with async/await to see which one looks more convenient. On the other hand, let result: (Data, URLResponse) = try await getData() will always clearly produce a single result because we don’t use an async sequence to obtain a single result we await the result of a task instead.Įven though this comparison technically compares Combine to async/await rather than async sequences, let’s take a look at an example of performing a network call with Combine vs. It can also be considered a downside because you never know whether an AnyPublisher will emit a single value, or many values. This means that publishers are used for operations that can emit many values as well as for values that produce a single value.Ĭombine’s approach to publishers can be considered a huge benefit of using them because you only have one mechanism to learn and understand a publisher. On the other hand, Combine doesn’t differentiate between tasks that produce a single output and tasks that produce a sequence of outputs. However, you typically wouldn’t leverage an async sequence to make a network call you’d await the result of a data task instead. That’s not to say an async sequence can’t deliver only one result, it absolutely can. While this is a familiar example for most of us, it isn’t the best comparison because async sequences aren’t made for performing work that produces a single result. Our first comparison takes a closer look at operations with a single output. Let’s dive in, and take a look at some current use cases where publishers and async sequences can truly shine. I’m comparing AsyncSequence to Publisher using Xcode 13.3, and with the Swift Async Algorithms package added to my project. Also note that I’m not going to speculate on the futures of either Swift Concurrency nor Combine. I’m trying to make sure that this comparison is fair, honest, and correct but of course my experiences and preferences will influence part of the comparison. Please note that parts of this comparison will be highly opinionated or be based on my experiences. If you want to learn more about lifecycle management, take a look at this post. The post you’re reading now will focus on comparing use cases. Lifecycle of a subscription / async for-loop Swift Publisher 5.5 adds the ability to create label designs for optical media, then print directly to disc with supported hardware.I will focus this comparison on the following topics: While the basis of what we can do with both AsyncSequence and Publisher sounds similar, I would like to explore some of the differences between the two mechanisms in a series of two posts. A publisher will obtain or generate its values (asynchronously) over time, and it will send these values to subscribers whenever they are available. If this sounds familiar, that’s because a Combine publisher does roughly the same thing.
0 Comments
Leave a Reply. |