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React Js Developer Interview Questions

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538 react js developer interview questions shared by candidates

1.Tell me about yourself 2. what is the difference between functional and class component? 3. how do you update between sibling components in react? 4. what is closure? 5. what is promise? 6. what is the spread operator? 7. what is destructuring? 8. how do define array and object values? 9. difference between the arrow function and the traditional function? 10. how do you access array and object values? 11. difference between var, let, and const?
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React Js Developer

Interviewed at Inncrewin Technologies

4.6★
May 25, 2021

1.Tell me about yourself 2. what is the difference between functional and class component? 3. how do you update between sibling components in react? 4. what is closure? 5. what is promise? 6. what is the spread operator? 7. what is destructuring? 8. how do define array and object values? 9. difference between the arrow function and the traditional function? 10. how do you access array and object values? 11. difference between var, let, and const?

1st round: Simple questions on react - why and what of react. Virtual dom . simple array and object manipulation in javascript. Lifecycle of react. 2nd round: Some concepts in react and react hooks(about use context, use ref, use callback, usestate, usereducer) redux, redux thunk, Form validation in react. Difference between Props and state. the version of react which you used. What and why of closure. Why do we need typescript ?. Be genuine of what you know and what you dont know. My interviewer asked questions based on what i said i know
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Front End Developer (React JS)

Interviewed at MapleLabs

4★
Nov 26, 2021

1st round: Simple questions on react - why and what of react. Virtual dom . simple array and object manipulation in javascript. Lifecycle of react. 2nd round: Some concepts in react and react hooks(about use context, use ref, use callback, usestate, usereducer) redux, redux thunk, Form validation in react. Difference between Props and state. the version of react which you used. What and why of closure. Why do we need typescript ?. Be genuine of what you know and what you dont know. My interviewer asked questions based on what i said i know

1- Introduce yourself. Started from the very first step. OOP. They ask me to rate my OOP concept from a scale of 1 -10. Four pillars of OOP? What is inteheritance? Polymorphysm? Abstraction? Encapsulation? Type of Polymorphysm? And also define those. Interfaces? Type of inheritance. can we extend one class from two other classes I said yes and then they ask me how? Then the react JS Question come. What is React JS? Why we use React Js? what is a compoenets? what is the diff btw class and function components? what is state in a components can we define our state in a components? How? what are the stages of components? Ans: there are four stages of a component. what are the features of ES6 that are not in the ES6 specifically to the react js? How do we make react js render the server-side script?
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React Js Developer

Interviewed at Nestosh

4.2★
Mar 8, 2023

1- Introduce yourself. Started from the very first step. OOP. They ask me to rate my OOP concept from a scale of 1 -10. Four pillars of OOP? What is inteheritance? Polymorphysm? Abstraction? Encapsulation? Type of Polymorphysm? And also define those. Interfaces? Type of inheritance. can we extend one class from two other classes I said yes and then they ask me how? Then the react JS Question come. What is React JS? Why we use React Js? what is a compoenets? what is the diff btw class and function components? what is state in a components can we define our state in a components? How? what are the stages of components? Ans: there are four stages of a component. what are the features of ES6 that are not in the ES6 specifically to the react js? How do we make react js render the server-side script?

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