This content was released on Aug 6 2019. The official support period is 6-months from this date.
Swift 5.1 adds polish that you can take advantage of when building your next great app. Check some of them out like default value for memberwise initializers, implicit returns from single-expression functions and static subscripts in this screencast.
This is a companion discussion topic for the original entry at https://www.kodeco.com/4690167-what-s-new-in-swift-5-1-miscellaneous-changes