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React job interview questions

QUESTION 1:

How do you render lists in React?

React Junior

QUESTION 2:

Why do we need keys for React lists?

React Junior

QUESTION 3:

What are React fragment used for?

React Junior

QUESTION 4:

How do you pass data to React components?

React Junior

QUESTION 5:

How is React shadow DOM different than virtual DOM?

React Junior

QUESTION 6:

What is React virtual DOM?

React Junior

QUESTION 7:

What is React shadow DOM?

React Junior

QUESTION 8:

What are bundlers in React?

React Junior

QUESTION 9:

What is JSX in React?

React Junior

QUESTION 10:

What is prop drilling in React?

React Junior

QUESTION 11:

What are package managers in React?

React Junior

QUESTION 12:

What three dots mean in React code?

React Junior

QUESTION 13:

What are React hooks?

React Junior

QUESTION 14:

What is uncontrolled component in React?

React Junior

QUESTION 15:

What is a controlled component in React?

React Junior

QUESTION 16:

How is state different than props in React?

React Junior

QUESTION 17:

What is props in React?

React Junior

QUESTION 18:

What is mounted component in React?

React Junior

QUESTION 19:

Which methods would you use to handle events in React?

React Junior

QUESTION 20:

How would you avoid binding in React?

React Junior

QUESTION 21:

When would you use useMemo in React?

React Junior

QUESTION 22:

What method would you use to check and improve speed of React app?

React Junior

QUESTION 23:

Which methods would you use to conditionally add attribute to components in React?

React Junior

QUESTION 24:

How would you use validation on props?

React Junior

QUESTION 25:

Why would you use super constructors with props arguments in React?

React Junior

QUESTION 26:

In which situation would you use refs in React?

React Junior

QUESTION 27:

Why do you need to use refs in React?

React Junior

QUESTION 28:

What are refs in React?

React Junior

QUESTION 29:

What is better in React? Functional or class component?

React Junior

QUESTION 30:

What is difference between functional and class component?

React Junior

QUESTION 31:

What is class component in React?

React Junior

QUESTION 32:

What is functional component in React?

React Junior

QUESTION 33:

Do hooks replace high order components in React?

React Junior

QUESTION 34:

What happens if you attempt to update the state directly in React?

React Junior

QUESTION 35:

What are the React lifecycle stages?

React Junior

QUESTION 36:

What are 3 advantages of using React hooks?

React Junior

QUESTION 37:

How often does useState update in React?

React Junior

QUESTION 38:

What is useState() good for in React?

React Junior

QUESTION 39:

How do you install React?

React Junior

QUESTION 40:

How do you create a React app?

React Junior

QUESTION 41:

What is React?

React Junior

QUESTION 42:

Why would you recommend to use React?

React Junior

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