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Ask HN: What language learn in 2017 to power up my technicals skills?

I'm currently a fullstack javascript developer and in the middle/long term I would like to become a backend only guy. Currently I'm searching a language to replace Node.js. For now I have this one in mind : Ocaml, Rust, Go and Haskell. (by preference order) Do you have some advices about this languages ?

smt88 9y ago
Do you want to get better at programming, or do you want to be more appealing to employers? I ask because (for example) learning C# or Python would open up a lot of job opportunities, but learning OCaml or Haskell would be a better learning experience.
yawaramin 9y ago
No doubt in my mind, learn OCaml. Many exciting projects and communities. JavaScript-like syntax and tooling: ReasonML. Best-in-class JavaScript transpiler and integration with the node/npm ecosystem: BuckleScript. Concurrent HTTP service builder stack: Cohttp. Full-stack Web toolkit: Ocsigen/Eliom. Plus OCaml is a powerful, fast, elegant language. It's a great investment. Grab a copy of Real World OCaml and start today :-)