filter -> flatMap / compactMap without arguments

orElseThrow is something you might need more often in Java, Swift handles optionals with if let / else checks or Result enums instead of functions that either result an object or throw an Exception. Throwing errors / exceptions is pretty rare in the language compared to the Java / C# world.

Only when doing stuff like mapping JSON I set up try / throw trees because in the end I might not care about the Error at all and just discard it.