I would (if I was an insane masochist) start with reading the source code of JS from the first version onwards to get a sense of things. https://www.w3schools.

I would (if I was an insane masochist) start with reading the source code of JS from the first version onwards to get a sense of things. https://www.w3schools.com/js/js_history.asp https://www.w3schools.com/js/js_history.asp and https://www.w3schools.com/Js/js_versions.asp https://www.w3schools.com/Js/js_versions.asp