Interview Kickstart Interview Questions and Answers

Q1. Difference between useMemo and useCallback ?
Ans. 
useMemo is used to memoize a value, while useCallback is used to memoize a function.
• useMemo is used to memoize a computed value and recompute it only when its dependencies change.

• useCallback is used to memoize a callback function and prevent unnecessary re-renders.

• Example: useMemo can be used to memoize the result of a complex computation, while useCallback can be used to memoize an event handler function.
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Q2. How we do error handling in js ?
Ans. 
Error handling in JavaScript involves using try-catch blocks, throwing errors, and using error objects.
• Use try-catch blocks to catch errors and handle them gracefully

• Throw errors using the throw keyword to indicate when something goes wrong

• Use error objects like Error, SyntaxError, TypeError, etc. to provide more information about the error

• Handle asynchronous errors using promises and the .catch() method
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Q3. What is Promises ? Write a Polyfill of Promise.all()
Ans. 
Promises are objects representing the eventual completion or failure of an asynchronous operation.
• Promises are used to handle asynchronous operations in JavaScript.

• Promise.all() takes an array of promises and returns a single promise that resolves when all of the input promises have resolved.

• A polyfill for Promise.all() can be implemented using a combination of Promise and Array.prototype.reduce().
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Frontend assignment make the CRUD application using of reactj.s

A basic screening round with one coding problem and basic technical questions .

LLD of LRU cache in any language

System Design of whatsapp group and one on one chats.

Q1. Entire end to end basic structure of any website from networking domain server till implementation with as much details and scaling questions
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Q1. Past experience
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Q2. How to handle objection
Ans. 
Handling objections involves active listening, empathizing, addressing concerns, and providing solutions.
• Listen actively to understand the objection

• Empathize with the person's concerns

• Address the objection directly and provide relevant information or solutions

• Ask open-ended questions to uncover underlying issues

• Handle objections calmly and professionally
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Q1. Elevator pitch. About the past exp .....
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