Swift 6.4 Brings Subprocess 1.0, Improved Interoperability, Faster Wasm, and More

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Posted on Sun Sep 27 2026 | 7:30 pm

The latest release of Swift, Swift 6.4, introduces a range of language and tooling improvements, including better performance through expanded support for non-copyable values, up to 40 times faster Wasm generated code, improved interoperability with C++20 and Java, and a new Subprocess library that provides a cross-platform API for launching and interacting with external processes.

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