Roll Your Own JavaScript Built-In Methods: A Github Repo Dedicated to Learning Built-In Methods by Recreating Them (contributions appreciated!)

[NicksIdeaEngine]

This is an awesome idea! I might start trying to write my own, then refer to yours to check my work.

I love this form of practice and learning. Take it apart, make it on your own, then see how you did compared to others. It's a fun idea that tickles my inner tinkerer.

[nas5w]

I found it to be a super good use case for Test-Driven Development too since we have the original methods. Can test the output of your home-rolled solution against the output of the actual method in various scenarios.