[pdamoc]

I learned Elm and Elixir few years ago. In both case, it took me about a week from "hello, world" to having the feeling that I can program in that language. I did this using only online learning materials and the support forums for those languages. With a colleague available I imagine that things would have been even smoother.

A lot of companies vastly overestimate the difficulty of getting a decent developer up to speed with a new language. In a lot of cases, it might be easier to learn a new language than a new, complex library for a language that you already know.