Ask HN: What practical modern programming languages should I try to pick up?

I know this is a boring question, but I am ready to add another language to the resume and would like to know what people think are the most practical and interesting of the up and coming programming languages.

I don't have any requirements other than that it be a language that you feel is swiftly approaching broader acceptance in the software community. Also Go, Rust, and Scala are already on my short list, but I would love to hear which of them people think I should start with. I am not super interested in javascript or anything built on it but am open to having my mind changed.

Thanks for humoring me.