Here are this year's WWDC Swift Playground Coding Challenges:
* Design a quiz in Swift Playgrounds
* Create a musical instrument in Swift Playgrounds
* Create visual effects in Swift Playgrounds
* Sense the world around you in Swift Playgrounds
https://t.co/LXEuJQ2uLO
SwiftUI introduces some new lazy grid and stack views to optimize performance. The View does not create the items until they are needed.
https://t.co/JmPwOzStRn
Apple also added CryptoKit, which makes it much easier to perform common cryptographic operations. They also provide a sample playground. 🔑 #WWDC19
https://t.co/DcU1PTPImH