React Js Developer Interview Questions

538 react js developer interview questions shared by candidates

The interview was a bit long around 50 mins, interviewer asked me one simple javascript code to reverse an array in two ways, then gave me some react code snippet and told me to add some code to it, then questions about react hooks, lifecycle methods, especially useEffect, Dom and virtual dom, output of a react code snippet, and more theory questions related to javascript looping methods, then about the reduce method of js. Next round was Manager interview, he asked me about my projects, challenges i faced during making it, time it took to make, error handling, some more react questions like ssr and error handling, then he asked what is redux. Then some general questions like what are you looking for and so on.
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React js intern

Interviewed at FlexiEle Consulting

2.9
Aug 13, 2023

The interview was a bit long around 50 mins, interviewer asked me one simple javascript code to reverse an array in two ways, then gave me some react code snippet and told me to add some code to it, then questions about react hooks, lifecycle methods, especially useEffect, Dom and virtual dom, output of a react code snippet, and more theory questions related to javascript looping methods, then about the reduce method of js. Next round was Manager interview, he asked me about my projects, challenges i faced during making it, time it took to make, error handling, some more react questions like ssr and error handling, then he asked what is redux. Then some general questions like what are you looking for and so on.

Q: What is react? Q: Why do we use react instead of other frameworks? Q: What is the virtual dom concept? Q: useState & use effect hooks? Q: Class-based component and functional component? Q: How to call parallel call API? Q: Use of Key word in React? Q: diff between === & == Q: Basis width of mobile phone? Q: universal selector? Q: media query? Q: diff between absolute and relative position?
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React Js Developer

Interviewed at FynTune

3.3
Jan 6, 2023

Q: What is react? Q: Why do we use react instead of other frameworks? Q: What is the virtual dom concept? Q: useState & use effect hooks? Q: Class-based component and functional component? Q: How to call parallel call API? Q: Use of Key word in React? Q: diff between === & == Q: Basis width of mobile phone? Q: universal selector? Q: media query? Q: diff between absolute and relative position?

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