alt Hacker NewsI really like modern Swift. It makes a lot of what this author is complaining about, impossible.
The worst file I ever inherited to work on was the ObjC class for Instagram’s User Profile page. It looked like it’d been written by a JavaScript fan. There were no types in the whole file, everything was an ‘id’ (aka void*) and there were ‘isKindOfClass’ and null checks all over the place. I wanted to quit when I saw it. (I soon did).
Replies
glenjamin • today at 6:42 PM
Any advice on how to learn modern Swift?
When I tried to do learn some to put together a little app, every search result for my questions was for a quick blog seemingly aimed at iOS devs who didn’t want to learn and just wanted to copy-paste the answer - usually in the form of an extension method
Modern swift makes this technically possible but so cluttered that it's effectively impossible, especially compared with typescript.
Swift distinguishes between inclusive and exclusive / exhaustive unions with enum vs protocols and provides no easy or simple way to bridge between the two. If you want to define something that typescript provides as easy as the vertical bar, you have to write an enum definition, a protocol bridge with a type identifier, a necessarily unchecked cast back (even if you can logically prove that the type enum has a 1:1 mapping), and loads of unnecessary forwarding code. You can try and elide some of it with (iirc, its been a couple years) @dynamicMemberLookup, but the compiler often chokes on this, it kills autocomplete, and it explodes compile times because Swift's type checker degrades to exponential far more frequently than other languages, especially when used in practice, such as in SwiftUI.