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Do I have to download swift on my computer?
Do I have to download swift on my computer and is the program costly?
Swift is free and can be accessed online on sites such as this or this. There is a distinction to be made between Swift itself and the iOS libraries, I think. i don't know if you can easily access the iOS libraries on an emulator or if this requires Xcode, which will only install on an Apple machine like a Mac or MacBook. It may be possible to emulate the OSX environment on a non-Apple machine.