I started Advent of Code with Javascript at 2019. During the competition, I found Ruby very easy to use, so experiment with it that year. At 2020, I looked for a type-safe language, which led me to Kotlin in 2015 folder. Later I got interested at Haskell, and blended some in 2020 folder.

use CodeRunner editor, basically just run it.

use IntelliJ editor, run test folder.

  npm install
  npm run 2015
  npm start
  npm run 2018-rb
  npm run 2015-rb