Anyone else planning on rotating languages? I think that using a different language every day is too much of a stretch for me, but I plan to switch between C++, Rust and Julia.
I did 20 languages last year and I'm gonna stick to 1-2 this year :P Wasn't exactly stressful, but it didn't help being quick and having nice solutions. Wrote a summary: https://f5n.org/blog/2019/advent-of-code-2019/
Julia, Common Lisp, and maybe Haskell or something like that for me. I use Julia to get the correct solutions in a naive way, then I optimise the approach and compare the efficiency of the languages. It's pretty fun. Yesterdays puzzle was 0.0002 in Julia and 0.002 in CL for the exact same approach.