This content was released on Dec 14 2017. The official support period is 6-months from this date.
Swift gives us a lot of new features when comes to dictionaries such as sequence based initialization, merging, grouping, and more. This screencast will walk you through the new features.
This is a companion discussion topic for the original entry at https://www.kodeco.com/4374-what-s-new-in-swift-4/lessons/2