It took me about 20 hours to just “implement the solution”.

Wanna “learn how to implement the solution”? Open up the library and read the code. Feel free to learn what you learn from it and make your own version of it.

And YES, this is DEFINETLY a library promo, and learning how to implement the solution would turn the article into bunch of math equations that you’ll probably nag about as everyone does in complex articles.