What’s The best new feature in swift?
Asked on 06/19/2025
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The best new feature in Swift, as presented at WWDC, is the introduction of the Swift 6 language mode, which provides data race safety guarantees. This feature turns data races, which are typically experienced at runtime, into compile-time issues, significantly improving the correctness and safety of concurrent programs. This is a major advancement in ensuring that Swift code is both safe and performant.
Additionally, Swift 6.2 introduces inline arrays, which allow for fixed-size arrays to be stored on the stack, enhancing performance by avoiding heap memory usage. Another notable feature is the new span type, which offers a safe alternative to pointers for fast, direct access to contiguous memory, improving interoperability with languages like C.
For more details, you can check the session What’s new in Swift (17:03) where these language updates are discussed.
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.
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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.