Discussion on: Top Interview Questions for Frontend Developers(React)

[🅖🅡🅔🅖🅞🅡🅨 🅞🅡🅣🅞🅝]

Odd interview questions - if I wanted to know how much a developer knew about React I’d be asking more about:

When do you deploy state vs. refs?
What are some gotchas of useEffect?
Under what conditions should you optimise using memo / callback?

For data only components, it’s much more effective these days to export logic out to a hook or render props - there are serious flaws with HoCs…

[Abhishek Raj]

Yes those questions can be asked if you are interviewing for intern/junior dev position.
If you are interviewing for senior dev position, more design/optimization questions are asked.

[🅖🅡🅔🅖🅞🅡🅨 🅞🅡🅣🅞🅝]

Not really. Nothing you’ve listed is really ‘senior’

[Abhishek Raj]

Yes I have only mentioned common react questions, not HLD or LLD questions.

[🅖🅡🅔🅖🅞🅡🅨 🅞🅡🅣🅞🅝]

Depending on the answers to my questions, I know: the above would really show an understanding of how react works and therefore an ability to:

• know how react decides to re-render (e.g. referential equality)
• know when & why to use imperative escape hatches over the declarative nature of react
• know when & why to optimize performance

Subjects I would not really expect a junior/intern to know much about.

[Abhishek Raj]

Its all about what are requirements of developers in which country.
In my country, even interns are required to know

1. When to use useState/useRef?
2. How to use useEffect?
3. When/How to optimise using memo/callback?

[Austin Webb]

Is there by chance anyway you could provide a brief answer to “what conditions should you optimize memo / callback?”

I’m a “junior” dev and would like to understand this. The reason why I’m asking is because everything I’ve read online regarding this topic has been more theory than application.

I would greatly appreciate any input that you have to give. Cheers

[🅖🅡🅔🅖🅞🅡🅨 🅞🅡🅣🅞🅝]

Sure, I'll write an article on it and link back here.