The following are my entries for the 2021 Advent of Code at http://adventofcode.com. I tried to leverage this opportunity to dust off my old chops using langauges like Ruby and hone in my current skill set learning new Swift skills such as async/await.
When I started the Advent and saw the challenges, Ruby immediately came to mind. Well, actually Perl came to mind, but then Ruby came to mind. It was fun to dust off these chops but hanging out in a type safe language for so long has Ruby feeling pretty cringey.
I remembered that you can use Swift for shell scripts. It bugged me that most Swift solutions online for streaming the contents of a file involved reading in the entire file and splitting it on \n.
Initially I solved the first problem using a mutable pointer to stream the contents in small chunks. Then my coworker enlightened me to the fact that async/await brought some new sugar for streaming the contents of a file. The The only problem is that it segfaults on files of more than 150 lines or so. Barring that catastrophic issue, you've gotta check out this syntax.
I wasn't as happy with the resulting code on this one because a lot of it is operationally inefficient. Reiterating over the same arrays over and over and whatnot. That being said, I tried to bring reducers into the picture to help solve problems and I was able to get through the solution.