### Index [One-sided Ranges](#one-sided-ranges) [Strings](#strings) Multiple Type Definition https://digitalleaves.com/blog/2017/06/whats-new-in-swift-4/ ### Strings ### #### #### #### String is a Collection again (of new type Substring) For a while we had string.characters.. which was clunky. {% highlight swift %} let greeting = "Hello, 😜!" greeting.count for char in greeting { print(char) } let comma = greeting.index(of: ",")! let substring = greeting[..