Swift is the mandatory language for all Apple platforms—iOS, macOS, watchOS, and visionOS—making it essential as the Vision Pro ecosystem matures. Swift 6 introduces complete concurrency checking and improved data-race safety, reducing bugs by an estimated 30% compared to prior versions. For Apple-centric development, Swift offers tighter integration than #8 SQL or #5 JavaScript, with performance 2.6x faster than Python in compute-bound tasks.
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