When I decided to migrate from my country, I started to apply to many companies, and immediately realized that most of them required at least a 80% knowledge in data structures, algorithms and complexity (the rest is coding).
So.. this would be my white board, to take out the dust from my old books, and the newer version of them...
Every algorithm will have a series of tests, to prove accuracy and performance (like hackerRank does).
The command for running it would be:
jest "name of the folder/file" --watch
NPM: npm init
Jest: npm install jest -g