Advent of Code Update

First, consider reading my original post on Advent of Code here

Assuming you’ve read that, here’s my update:

I finished year 2022 in surprise! Kotlin! You can find the code here:

Even though I didn’t even mention Kotlin in my last post, it’s the primary backend language that I use now for work. I ended up not staying at the startup that used Python, but I’m still a fan of Python. In fact, I even went back and finished 2021 in Python.

Updated language thoughts


  • Probably the best (most pragmatic) language I’ve used for Advent of Code.
  • It’s at least a Better Java, likely the best language on the JVM, and a strong contender for best static language. Can use any Java libraries practically natively. I like Guava and Eclipse Collections
  • Builds and runs very fast.
  • Fantastic IDE support through IntelliJ. Great debugging, profiling, and gives suggestions
    • For example, if you do a map followed by sum it will suggest just doing sumOf. So much better than memorizing all of Clojure’s sequence functions.
  • Powerful/expressive features like: DeepRecursiveFunction, extensions, when expressions, and data classes
  • Cons/Missing: Python’s tuples and dynamically growing int, Clojure’s assoc-in and friends, and Rust’s match


  • Same points as before: especially well-suited for Advent of Code
  • Occasionally run into dynamic-language specific issues like this:
    • return a, b if condition else None I expected (a,b) | None, but got (a, b|None)

It’s the classic Static vs Dynamic languages: dynamic languages require less up-front time but cost more in runtime and tracking down type issues at runtime; whereas, static languages have the opposite trade-off.

Now, there’s a language that’s further on the up-front spectrum: Rust.


  • Blazing speed: it’s just impressive seeing any code running in microseconds
  • Powerful features: top-tier enums, match, map/reduce/etc
  • Cons: Directly dealing with pointers Box/Arc/etc. Incredibly verbose.

I am more familiar with Rust now after reading and working through The Book, Rust by Example, and Rustlings.

Progress by Year and language (as of Apr 2023)

  • Year 2015: 🎄 DONE! multiple times!
  • Year 2016: ❄️ ON ICE @ Day 20
    • Days 1-7 & 19 in Python
    • 1-11 in Clojure and 11-18 in Java.
    • 1-12 in Go
  • Year 2017: ❄️ ON ICE @ Day 7
  • Year 2018: ❄️ ON ICE @ Day 6
  • Year 2019: ❄️ ON ICE @ Day 2
  • Year 2020: 🎄 DONE!
  • Year 2021: 🎄 DONE!
  • Year 2022: 🎄 DONE!