I also don&#x27;t get it.<p>What makes Swift better than other ML like languages for the mainstream developer is the tooling. e.g. Playgrounds and IDE support, and Apple forcing developers to adopt it (Objective-C had only a few WWDC sessions).<p>For anything else, Haskell, OCaml, Rust and even F# are better options, as they are more mature, already portable and lots of libraries to choose from.