Swift 4 has been in the works for the last few months. If you're like me, you might follow Swift Evolution to stay up to date with all the proposals and changes. Even if you do, now is a good time to review all the additions and changes to the language in this new iteration.
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There are two ways to run Swift 4. You can either install the Xcode 9 beta if you have a developer account with access to it or you can set up Xcode 8 to run with a Swift 4 snapshot. In the former case, download the beta from your developer account download page.
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Switch to Xcode now and go to Xcode > Toolchains > Manage Toolchains. From there, select the newly installed Swift 4.0 snapshot. Restart Xcode and now Swift 4 will be used when compiling your project or playground. Note that all the code presented in this tutorial is also available in a GitHub repo.
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If you are interested in going deeper into the new Swift 4 features, here are a few more resources:
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