Learn what's new in Swift 4.1 with a playground

See the code, run the code, edit the code

Paul Hudson    April 4th 2018    @twostraws

Previously I wrote about the new features in Swift 4.1, but it's a lot more fun to see things in action and experiment yourself.

So, I just released an Xcode playground that demonstrates the new features introduced in Swift 4.1, complete with examples that I hope make them easy to understand and apply in your own work:

• Synthesized Equatable and Hashable
• Key decoding strategy in Codable
• Conditional conformances
• Recursive constraints on associated types
• Build configuration import testing
• Target environment testing
• flatMap() is now (partly) compactMap()

The playground is available on GitHub, so I hope you'll try it for yourself: what's new in Swift 4.1?

I should add that the task of building this playground was made much easier thanks to previous work done by Ole Begemann.

SAVE 50% To celebrate WWDC23, all our books and bundles are half price, so you can take your Swift knowledge further without spending big! Get the Swift Power Pack to build your iOS career faster, get the Swift Platform Pack to builds apps for macOS, watchOS, and beyond, or get the Swift Plus Pack to learn advanced design patterns, testing skills, and more.

Save 50% on all our books and bundles!