I didn't feel like I understood JS for the first two years or so that I used it professionally. Once I dug into the prototypical inheritance and functions as a first-class object things really started to click, and ever since ES6 came out it's been a favorite language of mine.
I'm a french software engineer and I have been working with javavascript as a fullstack web developper. I love how Exercism enhance the process of learning new languages, that's why I wanted to be part of it :)
I love learning to the point I got degrees in how/why people think the way they do and how to teach them. Then I learned how to program and have been trying to teach others as often as I can. Hope I can help.