Not the OP but someone who also finds Swift brilliant I really enjoy the value types — real structs with copy-on-write behaviour (internally). So there's a lot

Not the OP but someone who also finds Swift brilliant I really enjoy the value types — real structs with copy-on-write behaviour (internally). So there's a lot of freedom to model your application with a single source of truth that can be updated in a transactional way, diffed, unified, intersected, without worrying about any leftover state causing bugs Protocols and protocol extensions are very powerful. Allowing you to write a generic interface and then add explicit functionality to anything which adopts that interface in a very clear way In combination with pattern-matching enums which can store uniquely typed data with their cases, it makes it very easy to model complex systems in a readable, maintainable way The combination of all these things, plus powerful generics and a very thoughtfully designed set of foundation APIs, makes it very pleasurable to write and read Swift code The new async/await functionality also seems like it was considered for a long time. It manages to stop you from doing stupid things with threading at compile time by being conservative about how you can use structures concurrently