Swift, the programming language used for macOS, iOS, and Apple OS, is now available on Windows via downloadable toolchain images.

But Swift is best on iPhone and iPad, because of Apple's own investments in the programming language. So as developers use Swift more and more, they're going to be making apps that simply run ...

An open source Swift could grow to compete with other languages on other devices—and even inside data centers. That's good for the developer world, and well, it's good for Apple.

Calling it "fast, modern, safe and interactive," Apple on Monday unveiled Swift, a brand new Xcode programming language that it says is superior to Objective-C.