Swift-Summary from Juan Antonio Karmy is a collection of Xcode playgrounds for learning the basics of Swift.
Swift-Summary includes 23 lessons in total, is up to date with Swift 2.2, and the key advantage of using Swift summaries vs the documentation is that you can learn interactively.
Here is an image showing the playgrounds include with Swift-Summary:
You can find Swift-Summary on Github here.
A nice interactive way to learn the basics of Swift.
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