What prompted me to develop as a JavaScript developer was being put in charge of a major project that was mostly JS code. Up till then, I had done some JS work,

What prompted me to develop as a JavaScript developer was being put in charge of a major project that was mostly JS code. Up till then, I had done some JS work, using jQuery to add animations and interactions to a UI and some ajax. Doing this JS project exposed me to pretty much everything you can do with JS, and I learned it all pretty quickly so I could start contributing to the project. I only got this project too because the dev previously in charge of the project left the company and I asked about it. It's another lesson to new developers: never let an opportunity pass you by.