I’ve gotta go with Elixir. I’ve been using it professionally for about 7 years now, and it’s been amazing to see it grow in the way it has. It’s very well-designed, based on a rock-solid foundation (Erlang/OTP), has an amazing standard library with fantastic documentation, and has a strong culture of pragmatism and developer friendliness.

I personally work in web dev, and Phoenix has consistently shown itself to be an extremely capable web framework. LiveView has kicked off a new paradigm for making web applications that most major languages are copying.

There’s a solid embedded story with Nerves, and serious foray into ML/AI with Nx. It’s obviously not suited for the lower level stuff, but that’s when Rust integration with Rustler comes in. Many wouldn’t be interested in Elixir because of it’s dynamic typing, but there’s serious effort by the creator and a research team into developing a gradual type system for the language.

Just an overall solid language that’s extremely pleasant to use with a really healthy and (slowly but surely) growing community.