BYJU'S Front end Developer Interview Questions and Answers

Q1. Javascript object manipulation based coding question
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Q2. React based verbal questions
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Q1. Javascript questions
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Q2. Have idea how to fetch Data from an API
Ans. 
Yes, by using AJAX or Fetch API to make a request to the API endpoint and handle the response data.
• Use AJAX or Fetch API to make a request to the API endpoint

• Handle the response data by parsing it in JSON format

• Display the fetched data on the front end as needed
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Q3. React Question basics not hard
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Q1. What is memoization in react
Ans. 
Memoization is a technique used to optimize performance by storing the results of expensive function calls and returning the cached result when the same inputs occur again.
• Memoization helps to avoid redundant calculations by storing the results of function calls.

• It can be implemented using libraries like 'memo' in React or manually by storing results in a cache.

• Memoization is commonly used in React to optimize renderin...read more
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Q2. Promise vs promise all
Ans. 
Promise is used for asynchronous operations with a single result, while Promise.all is used for handling multiple promises simultaneously.
• Promise is used for handling asynchronous operations with a single result

• Promise.all is used for handling multiple promises simultaneously

• Promise.all waits for all promises to resolve or any one to reject
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Q3. Minimum sum path
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Q4. React Vs Angular
Ans. 
React is a lightweight library for building user interfaces, while Angular is a full-fledged framework with more features and conventions.
• React is more flexible and allows for more control over the code structure.

• Angular provides more out-of-the-box features like routing, forms, and HTTP client.

• React is easier to learn for beginners due to its simplicity.

• Angular has a steeper learning curve but offers more built-in too...read more
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Q5. In what cases will you use Promise.all
Ans. 
Promise.all is used to handle multiple promises concurrently and wait for all of them to resolve.
• Use Promise.all when you need to make multiple asynchronous calls and wait for all of them to complete before proceeding.

• It is useful for scenarios like fetching data from multiple APIs and processing them together.

• Example: Promise.all([fetch('url1'), fetch('url2')]).then(responses => { // handle responses })
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Q1. Situational questions
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Q2. Questions related to day to day work
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Q1. They have asked about my resume or working experience. how i implemented those features
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Q2. Merge 2 array and sort in ascending order in JS, use Effect Hooks, Debouncing, Throttling, about API integration, how u fetched and make faster API call.
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Api Call with pagination support, Card with button.

Same , Just changed the difficulties

3 coding question around prime number arrays and strings

Q1. Introduce youself
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Q2. Question around project and skill in the resume and one coding question to solve
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Q1. Question on project and skill in resume
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Q2. 2 question arouond data structer and algorithm
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Q1. Two pointer questions
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Q2. Are you married
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Number system,30 min duration

Q1. What is promises
Ans. 
Promises are objects representing the eventual completion or failure of an asynchronous operation.
• Promises are used in JavaScript to handle asynchronous operations.

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

• Promises can be chained together using .then() to handle success or failure.

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

• Example: const myPromise = new Promise((res
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Q2. What is html and css
Ans. 
HTML and CSS are languages used for creating and styling web pages.
• HTML (Hypertext Markup Language) is used for structuring content on a web page.

• CSS (Cascading Style Sheets) is used for styling the appearance of the content.

• HTML uses tags to define elements like headings, paragraphs, images, and links.

• CSS allows for customization of colors, fonts, layouts, and more.

• Both HTML and CSS are essential for creating visually
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