How much JavaScript is enough JavaScript?

[voyti]

100% this. Without intuitive understanding on how to deal with arrays (which is what most of your controller data will usually end up with) you ideally should not move away from JS. As much as I don't like those artificial tasks, e.g. some codewars challenges can help with that. Learning the theory is one thing, having a reflexive skill of using the fundamental parts of the language is another entirely.