Writing code to solve the puzzle from a classic children's book.
James and Rachel built an interactive video booth for their friends' wedding (and successfully deployed it during the cocktail hour)! Check out the code here: https://glitch.com/edit/#!/jemily-wedding-photobooth
This is my solution to day 3 of Advent of Code 2018 (https://adventofcode.com/2018/day/3).
I was pretty excited about this code, because it maps very cleanly to how I thought about the problem in my head when I sat down to write it. I think it's a great illustration of how nice it can be to solve problems like this in languages with built-in support for multidimensional arrays!