This content was released on Dec 28 2017. The official support period is 6-months from this date.
Xcode 9 provides a bevy of features that will help you write your code. In this screencast, you'll get a tour of them.
This is a companion discussion topic for the original entry at https://www.kodeco.com/4107-what-s-new-in-xcode-9/lessons/1