I put together answers for 600 of the most frequently asked questions I received from readers into one place: the Swift 4 Knowledge Base. It answers basic and advanced questions, and provides lots of free code you can re-use however you please. If you hit problems, try searching there first.
The project files for Hacking with Swift are all available on GitHub, where you can view them, fork them, or download them: click here for the GitHub repo.
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The Hacking with Swift guide book helps you learn faster, plus get an Xcode tips and tricks video and Swift wall chart.