Bad advanced JD questions will involve quirks of the language that experienced JS developers will have learned to avoid, like details of how type coercion and =

Bad advanced JD questions will involve quirks of the language that experienced JS developers will have learned to avoid, like details of how type coercion and == work. Good advanced JS questions (in my opinion) will involve things that are useful but also challenging, like details about promises, prototypical inheritance (that one is debatable, since some JS experts avoid that), the browser event loop, etc.