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Swift is open-source now, so it's not really Apple-dependent. Using the Swift Playgrounds doesn't mean your kid will be locked into the Apple ecosystem.

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There's nothing usable you can write in Swift that would run on other platforms. Lack of cross platform standard library makes portability only a lip services, "opensource" or not.

Actually, Foundation is being ported to Linux and there are already quite a few third-party libraries out there. I am successfully writing cross-platform server-side applications in Swift.

https://github.com/open-swift https://github.com/VeniceX https://github.com/Zewo

https://developer.apple.com/videos/play/wwdc2016/415/

This is just one example.

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