Recent articles

Swift 6 has been available to us for the better part of a year now, and more and more teams are considering or looking at migrating to the Swift 6 language mode. This typically involves trying to turn on the language mode or turning on strict concurrency, seeing a whole bunch of warnings or errors, […]

The Xcode 16.3 beta is out, which includes a new version of Swift. Swift 6.1 is a relatively small release that comes with bug fixes, quality of life improvements, and some features. In this post, I’d like to explore two of the new features that come with Swift 6.1. One that you can start using […]

When you’re using Git for version control, you’re already doing something great for your codebase: maintaining a clear history of changes at every point in time. This helps you rewind to a stable state, track how your code has evolved, and experiment with new ideas without fully committing to them right away. However, for many […]

On iOS 17 and newer, you have access to the Observable macro. This macro can be applied to classes, and it allows SwiftUI to officially observe properties on an observable class. If you want to learn more about Observable or if you’re looking for an introduction, definitely go ahead and check out my introduction to […]

When you turn on strict concurrency checking or you start using the Swift 6 language mode, there will be situations where you run into an error that looks a little bit like the following: Main actor-isolated property can not be referenced from a Sendable closure What this error tells us is that we’re trying to […]

When Apple released Xcode 16 last year, they made the Swift 6 compiler available along with it. This means that we can create new projects using Swift 6 and its compile-time data race protections. However, the big question for many developers is: Is 2025 the right time to adopt Swift 6 fully, or should we […]

With Swift 6, we have an entirely new version of the language that has all kinds of data race protections built-in. Most of these protections were around with Swift 5 in one way or another and in Swift 6 they’ve refined, updated, improved, and expanded these features, making them mandatory. So in Swift 5 you […]

Unit tests should be as free of external dependencies as possible. This means that you want to have full control over everything that happens in your tests. For example, if you’re working with a database, you want the database to be empty or in some predefined state before your test starts. You operate on the […]

Swift’s new modern testing framework is entirely driven by asynchronous code. This means that all of our test functions are async and that we have to make sure that we perform all of our assertions “synchronously”. This also means that completion handler-based code is not as straightforward to test as code that leverages structured concurrency. […]

In a previous post, I wrote about using the #expect macro to ensure that certain assertions you want to make about your code are true. We looked at testing boolean conditions as well as errors. In this post, I would like to take a look at a macro that goes hand-in-hand with #expect and that […]