With the new Xcode 9 Beta Apple has added support for Swift 4 adding a number of great new features.
Apple has posted a What’s New In Swift 4 video from WWDC on their site, and Ole Begemann has created a Swift playground that you can use to play with the new Swift 4 features mentioned at WWDC.
You can find the What’s New In Swift 4 WWDC 2017 talk on the Apple site.
You can find the Playground on Github here.
A nice way to get a quick start on Swift 4.
Original article: Swift 4 New Features Video And Playground
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