One interesting thing about this set of solutions is that many of the languages seem to use a pattern-matching approach (e.g. Elixir, F#, Rust, others, IIRC). As a result, having been reading about pattern-matching recently (in F# and OCaml), I was able to understand the gist of the solutions in those languages, although I did not know those languages well or even somewhat, in some cases. Of course, this is for FizzBuzz, for which the logic is easy, which makes it easy to make guesses about how the code works (for many languages at least).