My solutions for http://adventofcode.com
The solutions are saved in folders per year. There is also a utils folder where I try to keep useful strings and arrays manipulation functions to share across exercises.
$ yarn install
$ yarn dev
This will compile, run and watch the src/index.js with nodemon and babel.
This repo also has all the necessary modules for your favorite editor to lint and auto-format your code using eslint and prettier. Linting code in that kind of project may seem counter productive, but if your goal is to learn to write better quality code, then this could be an intersting thing to enable.