what new in concurency
Asked on 06/23/2025
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At WWDC, Apple introduced several updates related to concurrency in Swift. Here are some key highlights:
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Swift 6 Language Mode: Swift 6 introduces a new language mode that provides data race safety by default. This means that data race issues in your app are turned into compile-time errors, significantly improving the security and stability of your app. This mode is opt-in, allowing developers to adopt it when ready and module by module. What's new in Swift
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Concurrency Improvements in Swift 6.2: Swift 6.2 makes it easier to write single-threaded code by allowing modules or individual files to run on the main actor by default. This reduces the need for additional annotations and compiler warnings for code not intended to run in parallel. Platforms State of the Union
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Approachable Concurrency: Swift 6.2 introduces language changes that make concurrency more approachable. By default, code runs on the main actor, reducing the risk of data races. When ready, developers can offload specific code to the background to run in parallel, improving performance. What’s new in Swift
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Migration Tooling: Swift 6.2 includes migration tooling to help developers make necessary code changes automatically when adopting new concurrency features. This tooling is designed to make the transition smoother and more efficient. What’s new in Swift
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Concurrency Safety in Xcode 16: Xcode 16 provides concurrency safety guarantees by turning data races into compile-time issues. Developers can start adopting these features incrementally by enabling warnings for each upcoming language feature. What’s new in Xcode 16
These updates aim to make concurrent programming in Swift safer and more accessible, allowing developers to write more robust and efficient code.
What’s new in Swift
Join us for an update on Swift. We’ll talk about workflow improvements that make you more productive, and new and modernized library APIs for fundamental programming tasks. We’ll show examples of Swift adoption throughout more layers of the software stack. Finally, we’ll explore new language features for both improving approachability of concurrency, and achieving peak performance when you need it.
What’s new in Swift
Join us for an update on Swift. We’ll briefly go through a history of Swift over the past decade, and show you how the community has grown through workgroups, expanded the package ecosystem, and increased platform support. We’ll introduce you to a new language mode that achieves data-race safety by default, and a language subset that lets you run Swift on highly constrained systems. We’ll also explore some language updates including noncopyable types, typed throws, and improved C++ interoperability.
Code-along: Elevate an app with Swift concurrency
Learn how to optimize your app’s user experience with Swift concurrency as we update an existing sample app. We’ll start with a main-actor app, then gradually introduce asynchronous code as we need to. We’ll use tasks to optimize code running on the main actor, and discover how to parallelize code by offloading work to the background. We’ll explore what data-race safety provides, and work through interpreting and fixing data-race safety errors. Finally, we’ll show how you can make the most out of structured concurrency in the context of an app.