Careerfly 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

Q1. Tell me about yourself
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Q2. Why you chose this job
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Q3. Do you know about our company
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Q1. What about your salary expectations
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Q2. Do you any prior experience in sales
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Q3. Do i get any job referral from here
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Q1. Only self introduction
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Q1. General questions about you, with intro etc
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Q1. General questions abot your work / exp
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On the website I have worked upon and the coding language I know very well

Q1. Html css and javascript questions
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Q2. And basic of react
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To Design the portfolio to showcase our capabilities

Q1. Self introduction
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Q2. Details about previous work experience
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Salary expectation work experience concept about sales

Write a program to find the maximum value in an array of integers.

A bat and ball together cost $1.10. The bat costs $1 more than the ball.

Q1. Excel and Google sheet
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Good interaction with Founder