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https://github.com/twostraws/whats-new-in-swift-5-5


https://github.com/twostraws/whats-new-in-swift-5-5

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# What’s new in Swift 5.5?

This is an Xcode playground that demonstrates the new features introduced in Swift 5.5:

* Async await
* Async sequences
* Effectful read-only properties
* Structured concurrency
* `async let` bindings
* Continuations for interfacing async tasks with synchronous code
* Actors
* Global actors
* Sendable and @Sendable closures
* `if` for postfix member expressions
* Allow interchangeable use of `CGFloat` and `Double` types
* Codable synthesis for enums with associated values
* `lazy` now works in local contexts
* Extend property wrappers to function and closure parameters
* Extending static member lookup in generic contexts

This is designed to complement my existing article [What’s New in Swift 5.5](https://www.hackingwithswift.com/articles/233/whats-new-in-swift-5-5). You might also want to read previous articles about the evolution of Swift 5:

- [What’s New in Swift 5.4](https://www.hackingwithswift.com/articles/228/whats-new-in-swift-5-4)
- [What’s New in Swift 5.3](https://www.hackingwithswift.com/articles/218/whats-new-in-swift-5-3)
- [What’s New in Swift 5.2](https://www.hackingwithswift.com/articles/212/whats-new-in-swift-5-2)
- [What’s New in Swift 5.1](https://www.hackingwithswift.com/articles/182/whats-new-in-swift-5-1)
- [What’s New in Swift 5.0](https://www.hackingwithswift.com/articles/126/whats-new-in-swift-5-0)

Alternatively, I have a whole website dedicated to tracking [what's new in Swift](https://www.whatsnewinswift.com) – you should check it out at .

If you hit problems or have questions, you're welcome to tweet me [@twostraws](https://twitter.com/twostraws) or email .

![Screenshot of Xcode 12.5 running this playground.](playground-screenshot.png)