Order solved: 2023 -> 2022 -> 2015 -> 2020 -> 2021 -> 2024
Advancing knowledge of Kotlin, and focusing on using Sequences where possible for efficiently generating answers.
Less of a focus on pure immutability, but still using it plenty. Flesh out support code for reuse in other years & challenges.
Originally, I started AoC 2021 in Rust however I had set out to do it purely with immutability. This ended up being a bad idea, especially with a limited knowledge of the language at the time. Here on a number of years later, it's been completed in Kotlin. There was also a larger focus on being able to generalize code for re-use for use in future solutions.
I originally started AoC 2022 in Clojure, and ported it to Kotlin so that I could have a unified repo. So despite 2022 being solved after 2023, many of the solutions minimize mutability and object-oriented features of Kotlin, as would be standard in Clojure.
AoC 2023 was an excuse to sit down and learn Kotlin, so the solutions are very much non-object-oriented.
Making good use of the, at this point, quite extensive amount of library code to make the days easier.