Been there since 2.0. You can combine it with pattern matching to do some fun stuff: https://gist.github.com/airspeedswift/6e0c037ad5dd1b763d353f358791eef7#file

Been there since 2.0. You can combine it with pattern matching to do some fun stuff: https://gist.github.com/airspeedswift/6e0c037ad5dd1b763d353f358791eef7#file-rbtree-swift-L43 https://gist.github.com/airspeedswift/6e0c037ad5dd1b763d353f...