This will still be just a research prototype of a programming language and environment, so I don’t care about deployment issues. Want to have:
- Discriminated unions and pattern matching
- IDE with debugging
- Rich GUI framework with functional style (Elm/React)
- Healthy ecosystem
- Elm — nice and simple, but better suited to apps than an entire language environment. I really need mutation. Bit of a walled garden. Needs a real debugger (yes reproducibility improves printf debugging but it’s still just printf).
- Dart/Flutter — could work. Refreshing simplicity compare to the chaos of web programming. Flutter is very appealing. But I’ve used Dart before. It is an old-fashioned OO language and I’ve gotten tired of that. Wake up and smell the pattern matching! Working in Dart felt like living in a remote province.
- F#/Fable/React — nice, but a big language, with a lot of .NET baggage. Initial experiments ran into difficulties with the .NET tooling.
- ReasonML/Bucklescript/OCaml/React — technically powerful, but no one seems to be in charge and it’s a big hot mess. Bucklescript is one guy in China. No source level debugger.
- Swift/SwiftUI — very enticing: a modern language with a modern UI from people who really know their UI. Stealing the best parts of Flutter. Full tech stack fully documented and supported from one company with unbounded resources. Sadly, SwiftUI looks to be just too new. Still very mobile-centric. There isn’t even a table layout.
- Rust/? — Rust looks a bit scary, but some people I respect love it. There is no good GUI story yet. In a couple of years I expect there will be a SwiftUI clone, compiling to WASM and native. Could be my future production platform.
- TypeScript/React — utterly mainstream, and I already know it. Has a weak form of discriminated unions. Good enough.