[nrjdhsbsid]

Study google search results for "interview questions language X" with X being anything mentioned on the application. If js is listed expect things like the difference between == or === and whether variable declarations are hoisted for example.

Other questions I got were things like "can a static class be extended in language X" and other questions that test your trivia abilities but don't really matter when writing code 99% of the time. Like for js, everyone knows not to use == but most people don't know exactly why.

What I did was read several books on the language semantics for my top 2 languages cover to cover multiple times. The process was painful but I was prepared for nearly anything.

Answer quickly even if you might be wrong. Concise answers are perceived as more correct from what I've experienced.