React Js Frontend Developer

React Js Frontend Developer Interview Questions

Updated 19 Feb 2024

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Interview Questions

  • Q1. 1. What is difference between abstract class and interface ?

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  • Q2. In Interview round they will ask Basic questions related to your preferred job domain. In my case I have applied for React js developer they asked me javascript questions and commonly database questions. They asked me Oops concepts in Java and some advance concept in javascript since i don't know more about react . But Interviewer said no problem we will train you we just want your basic knowledge.

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  • Q3. 3. What is Difference between primary key and unique key ?

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  • Q4. 2. What is Arrow Function in Javascripts?

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  • Q5. 5. Why we require interface and what is interface in java ?

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  • Q6. 4. how you join three different tables in SQL ?

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  • Q7. 9. What is difference between overloading and overriding?

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  • Q8. 7. Is exception handling is required in a big project or we don't have to handle exception?

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  • Q9. 10. Which are the access specifiers in java ?

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  • Q10. 6. What is Encapsulation in java with example ?

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Interview Questions

  • Q1. After 3 coding they delayed 3 weeks saying its new year and the panel is on leave. Then 2nd week on Jan they took all my documents for verification, Discussed CTC and told they'll reach back and literally ghosted me for 5 days. When I talked to them, told that position is on hold and we don't need React.js developers anymore. 1 week later, I see there's another job posting from them saying React developer. A complete waste of time, No proper feedback. HR doesn't reply to your mails. These kind of people make it much harder on candidates who are trying to switch. Shame!

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  • Q2. make a collection of objects from the given data

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  • Q3. one aptitude question based on work manpower

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  • Q4. sort a string and array

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  • Q5. easy they ask basic question

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Interview Questions

  • Q1. 4. How can we mimic lifecycle methods using useEffect in functional components?

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  • Q2. Based on the project what functionality you develop that was toughest for you

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  • Q3. Simple question related to hoisting and hooks e.g. - 1. what is the difference between useCallback and useMemo? 2. What is Virtual DOM? 3. What is Hoisting? What is TDZ?

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  • Q4. how to update state in react components?

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  • Q5. What is State and Props in react?

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  • Q6. What is JSX in react?

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  • Q7. Tell about yourself

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  • Q8. React Basics and states & props and components and hooks and API

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  • Q9. Question-Related to react

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  • Q10. Hooks and why use and what benefits

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+2 interview questions

Interview Questions

  • Q1. Asked about debouncing and throttle (I mentioned them in projects). Then told me to write polyfill for those. What is reconciliation in React and how is it working after React 16 and how was it working earlier? (Hint - Read about Diffing algorithm and React fiber and also the priority scheduler in react fiber how does this selects the priority.)

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  • Q2. Started with simple questions like hoisting and virtual DOM, then progressed to event loop microtask queue and other concepts.

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  • Q3. Couple of output questions based on closure.

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  • Q4. What is Debouncing in JavaScript?

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  • Q5. What is an Arrow Function?

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Interview Questions

Interview Questions

+4 interview questions

Interview Questions

  • Q1. 1. Javascript data types, 2.Typeof of null and undefined and difference between null and undefined. 3. Class component vs Functional Component. 4. Sum of all array items. 5. Print prime number 1 to 100.

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  • Q2. Fundamentals of react js, Advanced Javascript, Html , CSS

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  • Q3. Logical questions from Javascript, Focused on problem-solving skills.

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Interview Questions

  • Q1. 1. React,js question like what is components, DOM , Virtual DOM, Real DOM 2. How do web page works 3. JavaScript 4. Basic real world problem solving questions based on DSA

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  • Q2. Interview Questions will be from the resume and will be basic and the ladder will go upto the high level based on the skills you have written in your resume

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Interview Questions

Interview Questions

  • Q1. JS predict output question Life cycle methods in react middlewares in react redux redux architecture virtual dom unit testing simple js program to use reducer fetch api simple task using grid controlled vs uncontrolled components

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