ElevateHQ React Js Frontend Developer Interview Questions and Answers

Q1. Polyfill for bind Closures Call apply bind let const var lexical environment scope output questions
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Q1. Basic JS question event loop, promises, polyfill.
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Q2. JS output based, Flatten object.
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Q1. What are promises
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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 using .then() to handle success and .catch() to handle errors.

• Example: fetch() API returns a promise that resolves with the response to a request.
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Q2. How js handle asynchronous codes
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JavaScript handles asynchronous codes using callbacks, promises, and async/await.
• Callbacks are functions passed as arguments to another function to be executed later.

• Promises represent the eventual completion (or failure) of an asynchronous operation and allow chaining of multiple asynchronous operations.

• Async/await is a modern way of handling asynchronous code that makes it look synchronous.

• Example: Using setTimeout w...read more
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Q3. Stair climbing leetcode question
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Q1. Event loop based questions
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Q2. Input output question
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Q1. React hooks , callback hook
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Q2. Create a component for counter
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Create a reusable component for a counter in web design and frontend development.
• Use HTML for structure

• Use CSS for styling

• Use JavaScript for functionality

• Implement increment and decrement buttons

• Display the current count
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Leetcode DSA problems

Q1. Create a pagination
Ans. 
Pagination component to display a list of items with page navigation.
• Create a Pagination component with props for total number of items, items per page, and current page.

• Calculate total number of pages based on total items and items per page.

• Display page numbers with previous and next buttons to navigate through pages.

• Update the list of items displayed based on current page.

• Handle click events on page numbers and previ
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Q1. Write a polyfill of JS promise
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A polyfill for JS promise is a piece of code that provides support for promises in older browsers.
• Create a Promise class with resolve, reject, then, and catch methods

• Implement the executor function to handle the asynchronous operation

• Use setTimeout to simulate asynchronous behavior

• Handle chaining of then and catch methods
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The first round is Hackerrank two algo and one UI test very easy, Second is Fundamentals of JS and React Native one must have a deep understanding of JS to do that I strongly suggest going through Akashay Saini's JS series It'll help and the Third is PS/DS asked some basic A&DS questions can be solved easily with little practice on Leetcode

Goof amount of core js questions were asked