I presented an hour long workshop on my work using Swift Playgrounds with my high school app development class as part of the Vietnam Tech Conference in February.
In previous years, I used Xcode for the course. This year to see how far I could go using only Playgrounds. I was impressed with how well it worked for giving my students feedback on their programming and letting them prototype apps using the SwiftUI framework from Apple. They have made some really great stuff this year just within Playgrounds.
You can access resources from the presentation here: