Dhanalakshmi College of Engineering Chennai 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. Sales experience
Ans. 
I have 3 years of sales experience in a previous role, where I successfully met and exceeded sales targets.
• Demonstrate ability to build relationships with clients

• Highlight experience in meeting and exceeding sales targets

• Discuss any specific sales strategies or techniques used
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Q2. Edtech experience
Ans. 
I have extensive experience with various educational technologies, including online learning platforms and interactive whiteboards.
• Implemented online learning platforms to enhance student engagement

• Utilized interactive whiteboards for interactive lessons

• Trained teachers on how to effectively integrate technology into their curriculum
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Q3. What's your highest education
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Q4. What are your dreams and goals
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Q5. Where do you see yourself in another 5 years
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Q1. Tell about data structure
Ans. 
Data structure is a way of organizing and storing data in a computer so that it can be accessed and modified efficiently.
• Data structures include arrays, linked lists, stacks, queues, trees, graphs, etc.

• They are essential for efficient algorithms and problem-solving.

• Example: An array is a data structure that stores a collection of elements in contiguous memory locations.
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Q2. What is aaray and its types
Ans. 
An array is a data structure that stores a collection of elements of the same type. There are different types of arrays like one-dimensional, two-dimensional, and multi-dimensional arrays.
• One-dimensional array: Stores elements in a single row or column.

• Two-dimensional array: Stores elements in rows and columns.

• Multi-dimensional array: Stores elements in more than two dimensions.

• Example: ['apple', 'banana', 'orange']
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Find largest element

Q1. Introduce yourself and research paper publications Details
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Q1. What is your favourite movie
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Q2. Tell me about your family
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Do you consider online shopping or offline shopping which one will you support and why

Q1. Why do you like to join in our company
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Q1. Program Related questions
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Q2. I will answer the required questions
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Q3. No other any questions
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