whats new in swift 6.2
Asked on 06/12/2025
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Swift 6.2 introduces several new features and improvements aimed at enhancing productivity and performance for Swift developers. Here are some of the key updates:
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Strict Memory Safety: Swift 6.2 introduces a feature called Strict Memory Safety, which requires explicit acknowledgment of unsafe API usage in the source code. This helps identify parts of the code that need extra security attention. This feature is being adopted in security-critical components like WebKit and a subsystem of the Messages app.
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Concurrency Improvements: Swift 6.2 changes the default behavior to stay single-threaded until concurrency is explicitly introduced. This makes the most natural code data race-free by default, providing a more approachable path to introducing concurrency.
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Performance Enhancements: The release includes performance-focused features like inline arrays, which allow arrays with a fixed size to be stored on the stack, enabling significant performance optimizations. A new span type provides a safe alternative to pointers for fast, direct access to contiguous memory.
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Development Workflow Enhancements: Improvements have been made to the development workflow, including better support for VS Code with features like background indexing and faster clean build times for projects using macro-based APIs.
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Library Updates: Swift 6.2 modernizes more of Foundation's API surface and introduces new APIs for everyday programming tasks, such as a new package for launching subprocesses.
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Embedded Swift: Swift 6.2 expands the capabilities of Embedded Swift, allowing developers to write code for highly constrained environments like firmware for embedded devices.
For more detailed information, you can watch the session What’s new in Swift (00:00:00) from WWDC 2025.
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.
Platforms State of the Union
Discover the newest advancements on Apple platforms.
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.