If you're looking for the type safety afforded by swift I recommend two languages: Elm and elm-ui for the front end. Elm is so safe that with the exception of

If you're looking for the type safety afforded by swift I recommend two languages: Elm and elm-ui for the front end. Elm is so safe that with the exception of the FFI and OOM it cannot have runtime errors. Rust for the backend. You already know C++ so borrowing (move semantics) references and whatnot should be pretty familiar. Rust is like C++ but without all the horrible baggage and swift esque type safety. Other people are like build stuff with this! Build stuff with that! They don't get it. I know what you're looking for: type safety in a good language without the garbage. Look into the two things above^^^^ Anyway the thing that's sort of related here is functional programming. Swift and Rust both share the same creator and the type systems from both are derived from Functional programming languages like haskell and OCaml. Elm derives its syntax from the same family, but elm is strictly functional while rust is not.