Advent of Code
Mostly this one will be more of an advertisement than an actual post, but still I would like to write about it.
From the beginning of December, the website AdventOfCode.com offers daily challenges for software developers to solve as programming exercises. You write code on your own in any language you prefer for the input provided by the website, and then you have to send back the results. At the moment I do it as a warm‑up before starting my work day.
My attempts are mostly written in Ruby (but I take into consideration using other languages for future assignments) and are available in my GitHub repository. Every user gets their own unique input data, but mine are provided within the repository (in case you want to try it out but the website no longer works).
I encourage everyone to try and complete those assignments — who knows, maybe you will learn something new!