These are tough interview questions.

I think I’d fail most of them, and I work as a senior Dev with JavaScript for near four years now.

If your looking for someone that knows JavaScript inside out. Sure.

But if you want someone to write you useful software, this would be like asking a farmer if he knew that you could grow wheat on Mars if you mixed a very specific chemical with Martian soil at a certain point on the surface.

Sure it’s neat to know, but its not going to give you a better harvest next season.