There is a real benefit to trying to figure out how the tools you use every day actually work. It forces you to think and also improve your architecture skill. Most of all it makes you understand why something is implemented in a certain way.
Have you ever wondered how a Promise actually works? Then this article is for you
You use test libraries every day, I hope. Have you ever wondered what makes them tick?
Want to understand what makes spies tick in testing by implementing it yourself? Then this is for you.
Recursion was one of those dreaded topics at Uni but if you got it WOW you could build some really elegant solutions. Recursion is everywhere, compilers, compression, search. Upskills with this elegant approach