Advent of Code is an Advent calendar of small programming puzzles for a variety of skill sets and skill levels that can be solved in any programming language you like. People use them as interview prep, company training, university coursework, practice problems, a speed contest, or to challenge each other.
For 2024, I've decided to solve the puzzles in Deno again mostly because of this: https://deno.com/blog/advent-of-code-2024. You can follow along with my (work-in-progress) solutions for 2024.
For 2023, I am solving the puzzles in Deno. See my solutions. They may not be pretty, but they work.