Swift 6.4 introduces several notable improvements including making Swift Build the default in Swift Package Manager, Subprocess reaching 1.0 for stable cross-platform process interaction, and enhanced C++20 std::span bridging. The release also delivers up to 40x faster WebAssembly execution via JavaScriptKit, expanded Embedded Swift support with existential types, and new array types that avoid copy-on-write overhead for non-copyable elements.
Background
Swift is an open-source general-purpose programming language developed by Apple for iOS, macOS, and server-side development. Version 6 focused on strict concurrency and memory safety, making 6.4 a significant incremental release.
- Source
- Lobsters
- Published
- Sep 16, 2026 at 02:55 AM
- Score
- 7.0 / 10