Often in the interview, interviewer asks about how virtual dom works or what is react or where is implementation of setTimeoutEffect(in v6 or ESMAScripts). Or Even in Nodejs interview they ask about event loop or v8 engine r libuv which is not required while programming with nodejs. I was just curios why they ask these, because in actual development I dont think these concepts are much helpful (even if those are the once we build things on), these are only for what is happening in background

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I am a Nodejs developer and having 5 years of experience. They ask event loop question because they want to know whether the candidate aware of the working functionality of nodejs or not. Yes they run behind the scenes.
To explain this here is a simple example suppose he is implementing or playing with setimmediate and process.tick , generally people memorize it that process.tick will execute first and the other with after it but why it is. If a person know about event loop and macro and micro stacks he will exactly know how it is happening and it will help him to debug his code well. This is just an example.

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Hey, I agree with you to an extent. But then again if you know how setimmediate or process.tick work(practical knowledge), you can easily debug the issues. But yes having knowledge of the underlying system helps.

What I think is we only need to know these concepts if we are working on improving performance of react/node or build features using these. If we just need to build backend API's and web applications why we need these?

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Folks
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