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I had that happen to me once. A candidate (college hire) chose to code in Haskell, which I had a passing familiarity with. We offered him the job, and he was definitely a strong hire, and we used Java mostly.

In my defense, they said beforehand that they use Scala, including the functional parts.

I also got a homework which I could implement in whatever I wanted and knowing they are a Clojure company… I chose OCaml. We did the review of the code, explaining the interviewer enough of ML to make him being able to understand the code and why I solved things this way. Was a fun day, would recommend it.

And I did get an offer.

Follow-up: someone saw the above comment, asked who I was, and it turned out my middle-school friend worked at the company. Interviewing somewhere new now.

Good luck!

Thanks!