Unfortunately, to my knowledge, the methods that you learn in any of the Playgrounds and Playground Starting Points are internal to these learning environments and are purely for instructional purposes. I don't think there exist any libraries that you can import to support the same operations found in these Playgrounds. The XCode Playgrounds only support "real" Swift code.So for example, if you wanted to make AR things like from AR Create, you actually have to use the methods from ARKit.
tetradium
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I'm a bit skeptical about @EricGolovin's response since the official rules tate that you may only "include third-party open source liscensed code and/or public domain images and sounds, with credit and an explanation of why it was used." I am assuming that public domain images and musics infers that any copyrighted material is also prohibited.