FactWise Interview Questions and Answers

They provided a json and a UI sketch of the expected UI feature. It was a simple user details listing with modal functionality and CRUD capabilities and search bar implementation.
Deadline was a week.

Q1. Difference between useState() vs useRef()
Ans. 
useState() is used to manage state in functional components, while useRef() is used to persist values between renders.
• useState() re-renders the component when the state changes, useRef() does not trigger a re-render.

• useState() returns a pair: the current state value and a function that lets you update it, useRef() returns a mutable ref object.

• useState() is used for managing component state, useRef() is used for accessi...read more
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Q2. What is useCallback()? Explain in depth
Ans. 
useCallback() is a React hook that returns a memoized callback function.
• useCallback() is used to optimize performance by memoizing functions.

• It is useful when passing callbacks to child components that rely on reference equality.

• It takes a callback function and an array of dependencies as arguments.

• The callback function is only re-created if any of the dependencies change.

• Example: const memoizedCallback = useCallback((...read more
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Q3. What is a callback? How is it accompanied with asynchronous programming
Ans. 
A callback is a function passed as an argument to another function to be executed later. It is commonly used in asynchronous programming.
• A callback function is often used in event handling, AJAX requests, and setTimeout functions.

• It allows the program to continue running while waiting for a response, improving efficiency.

• Callbacks can be synchronous or asynchronous, with the latter being more common in modern web devel
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Q4. Explain DOM and Virtual DOM. Difference between them.
Ans. 
DOM is a tree-like structure representing the HTML elements of a webpage. Virtual DOM is a lightweight copy of the DOM used for efficient updates.
• DOM stands for Document Object Model and represents the structure of HTML elements on a webpage.

• Virtual DOM is a lightweight copy of the DOM kept in memory by frameworks like React for efficient updates.

• Changes made to the Virtual DOM are compared with the actual DOM, and onl...read more
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Q5. What are promises?
Ans. 
Promises are objects representing the eventual completion or failure of an asynchronous operation.
• Promises are used to handle asynchronous operations in JavaScript.

• They can be in one of three states: pending, fulfilled, or rejected.

• Promises can be chained together using .then() method.

• They help avoid callback hell and make code more readable.

• Example: Fetching data from an API returns a promise that resolves with the da
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Q6. JS Event Loop architecture
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Q7. Implement a react app data fetching from API endpoints some operations, search bar implementation, implement debounce
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Max points you can obtain from cards - Leetcode medium Problem

implemented brute force approach, told the optimize approach
Got a good feedback from the interviewer and post 30 mins received a rejection mail from HR

Was given a problem statement and had to create an MVP version of the app(database, wireframe etc) keeping the in mind the various factors given

Q1. How would you build an hospital?
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Q1. General JavaScript-based interview questions- Currying, Chaining, hoisting, etc.
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Q1. DSA Round Easy to Medium level
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Q1. Yet to give xD
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Aptitude questions which includes quantitative and local reasoning and dsa qutions

Reactjs questions to build react application generally 5 to 6 questions.