I am talking about developer.apple.com too. Some of the examples in there don't necessarily depend on Apple-specific features. The Swift Standard Library documentation @ Apple Developer, for example. The standard platform is not specific to Apple platforms but the first thing you see when you open the website is an XCode playground, and that happens with a lot of topics that aren't related to Apple devices at all. That's not very good for people who well, don't have XCode. You'll either have to check the examples at swift.org (the website is very good, but it's not the first thing you'll see when you search for "swift docs") or going through tons of docs to find what you're looking for at Apple Developer.