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FactWise Interview Questions and Answers
6 Interview questions
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 = useCallb...
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 ac...
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, an...
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 t...
Implement a React app that fetches data from APIs with search functionality and debounce for performance.
Use `useEffect` to fetch data from API when the component mounts.
Implement a search bar using controlled components in React.
Use `useState` to manage search input and fetched data.
Implement debounce using `setTimeout` to limit API calls during typing.
Example of debounce: `const debounce = (func, delay) => { ...
Print Kaprekar number series of a given input
A Kaprekar number is a number whose square can be split into two parts that add up to the original number
Loop through the range of numbers and check if it is a Kaprekar number
Print the Kaprekar numbers found
FactWise Interview Experiences
7 interviews found
Anonymous
I applied via AngelList and was interviewed in Sep 2024. There were 3 interview rounds.
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.
(7 Questions)
- 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...
- 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((...
- 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...
- 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...
- 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...
- Q6. JS Event Loop architecture
- Q7. Implement a react app data fetching from API endpoints some operations, search bar implementation, implement debounce
- Ans.
Implement a React app that fetches data from APIs with search functionality and debounce for performance.
Use `useEffect` to fetch data from API when the component mounts.
Implement a search bar using controlled components in React.
Use `useState` to manage search input and fetched data.
Implement debounce using `setTimeout` to limit API calls during typing.
Example of debounce: `const debounce = (func, delay) => { let t...
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
Interview Preparation Tips
- Reactjs
- Javascript
- Nodejs
have hands on experience in problem solving easy to medium leetcode
Skills evaluated in this interview
I applied via Job Portal
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
(1 Question)
- Q1. How would you build an hospital?
Interview Preparation Tips
(1 Question)
- Q1. General JavaScript-based interview questions- Currying, Chaining, hoisting, etc.
(1 Question)
- Q1. DSA Round Easy to Medium level
(1 Question)
- Q1. Yet to give xD
I applied via Campus Placement and was interviewed in Feb 2024. There were 2 interview rounds.
Aptitude questions which includes quantitative and local reasoning and dsa qutions
Reactjs questions to build react application generally 5 to 6 questions.
I applied via AngelList and was interviewed in Jan 2024. There was 1 interview round.
Create an react app according to the design
Interview Preparation Tips
I applied via AngelList and was interviewed in Jan 2024. There was 1 interview round.
Quants,verbal,numbers,aptitude,digits,etc
Interview Preparation Tips
I applied via AngelList
O.A. on TripleByte
Questions related to Python, DSA, SQL
(2 Questions)
- Q1. Print Kaprekar number series of a given input
- Ans.
Print Kaprekar number series of a given input
A Kaprekar number is a number whose square can be split into two parts that add up to the original number
Loop through the range of numbers and check if it is a Kaprekar number
Print the Kaprekar numbers found
- Q2. Basic questions regarding APIs. For eg. What API would you create for X operation?
(1 Question)
- Q1. Final round with the founder. Typical HR questions were asked.
Interview Preparation Tips
Skills evaluated in this interview
Top trending discussions
Interview questions from similar companies
Interview Questionnaire
2 Questions
- Q1. Bootstrap
- Q2. Javascript
I applied via LinkedIn
Interview Questionnaire
1 Question
- Q1. Questions on basic html,css,javascript,angular
Interview Preparation Tips
Interview Questionnaire
1 Question
- Q1. What is event bubling
- Ans.
Event bubbling is the process of propagating an event from the innermost element to its parent elements in the DOM hierarchy.
Events in JavaScript are triggered on elements and then propagate up the DOM tree.
During event bubbling, an event triggered on a child element will also trigger on its parent elements.
This allows for event delegation, where a single event handler can be used for multiple elements.
Event.stopPropag...
Skills evaluated in this interview
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