BrainerHub React Js Frontend Developer Interview Questions and Answers

1 hour
React JS Basics
Codility

Q1. What is props drilling?
Ans. 
Props drilling is the process of passing props from a parent component to multiple levels of nested child components.
• Props drilling can lead to a complex and inefficient code structure.

• It can make it difficult to maintain and update the codebase.

• Using context API or Redux can help avoid props drilling by providing a centralized state management solution.
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Q2. What is pure component
Ans. 
Pure component is a class component in React that does not re-render if the state and props remain the same.
• Pure components extend React.PureComponent class

• They implement shouldComponentUpdate method with shallow comparison of props and state

• Pure components are more efficient than regular components as they prevent unnecessary re-renders
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Q1. Write a custom Promise class?
Ans. 
Custom Promise class implementation in JavaScript
• Create a class with constructor accepting a function parameter

• Implement then() method to handle successful resolution

• Implement catch() method to handle errors

• Implement finally() method to execute code after resolution or rejection
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10 reasoning questions and 20 Your domain questions

Q1. Questions are most conceptual
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Q1. Normal HR round
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Q1. Not schedule yet
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It was Either Aptitude Test/ JS puzzle round

Creating a simple billing management system using ReactJS

Q1. Asked about DS, About Me
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Q1. Just asked about what kind of person you are and more about you
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