SwiftUI is still evolving.  In fact, as of the recording of these lectures the latest version was Beta 5, Xcode 11.  Most of the source code in this course was written with Beta 4.

Do expect a lot of big and small changes as SwiftUI engineers tweak this framework.  I will be doing my best updating the content of this course so you have the most up-to-date information.

Fear not - even though things are changing with SwiftUI, the core is still going to be the same: Declarative and robust syntax :)