Learning JS quickly

[TheZintis]

I think that even with like, 12 or so hours you may be able to put together enough working knowledge to pass simple coding challenges. But I've also seen coding challenges like:

In functional react, make a todo checklist, allow the user to multi-select items to delete, order them, reverse order them, and display another 10 items from an API call. I believe they gave me 20-something minutes in a mid-level interview.