Not when I took it! I did most of those assignments in Haskell (a choice I came to regret). Double-checking and it seems the grader supports the following languages: C, C++, C#, Elixir, Erlang, Go, Haskell, Java, Lua, Node.js, Perl, PHP, Python 2.7, Python 3, Ruby, Rust, Scala, Swift.
Oh really? I was going off their own FAQ since the graded items requiring paying, and I didn’t want to do it if I couldn’t use the languages I wanted, namely F# and Racket.
From the FAQ:
> > Which programming language do I have to use in order to complete the assignments in this course?
> We expect learners to submit assignments in any version of Java, or Python. We will assume that you have basic programming ability in these languages, including a basic ability to understand and write simple object-based programs.
Yeah, I guess the FAQ is out of date. Think you should be to sign up for free if you want to check for yourself. I highly recommend it! And F# would be a pretty great language for this course, I think. Looks like no Racket (or any Lisp) support, though.