I couple of weeks ago I did a deep-dive into JavaScript scoping and learnt a lot about how closures work under the hood and why we the `this` keyword exists in the first place. I wrote a guide that explained everything to my two-weeks-younger self and made a video covering most of it too!

I try my best to back up everything I claim experimentally via chrome dev tools but there are a couple of things that are specific to ECMAScript. Let me know your thoughts :)