CoverPhoto
HCLTech logo
Premium Employer

HCLTech

Verified
3.5
based on 36.3k Reviews
Filter interviews by
Front end Developer
Skills
Clear (1)

10+ HCLTech Front end Developer Interview Questions and Answers

Updated 16 Sep 2024

Q1. What is Event Loop ? How it works?

Ans.

Event Loop is a mechanism in JavaScript that manages the execution of code and handles asynchronous operations.

  • Event Loop continuously checks the call stack and the message queue.

  • If the call stack is empty, it takes the first message from the queue and pushes it onto the call stack.

  • If the message is a callback function, it is executed and removed from the call stack.

  • If the message is not a callback function, it is passed to the relevant API for execution.

  • Once the API has fini...read more

Add your answer
right arrow

Q2. How to handle state in functional components.

Ans.

State in functional components can be managed using the useState hook in React.

  • Use the useState hook to declare state variables in functional components.

  • useState returns an array with the current state value and a function to update that value.

  • Example: const [count, setCount] = useState(0);

  • State variables should be immutable, so always use the setter function to update them.

Add your answer
right arrow

Q3. javascript promise method

Ans.

JavaScript Promise is an object representing the eventual completion or failure of an asynchronous operation.

  • Promises are used to handle asynchronous operations such as fetching data from an API.

  • They have three states: pending, fulfilled, or rejected.

  • Promises can be chained using .then() and .catch() methods.

  • Promises can also be created using the Promise constructor.

Add your answer
right arrow

Q4. What is event loop in javascript.

Ans.

Event loop in JavaScript is responsible for handling asynchronous operations by executing callback functions in a non-blocking way.

  • Event loop is a mechanism that allows JavaScript to perform non-blocking operations.

  • It continuously checks the call stack and the callback queue to see if there are any functions that need to be executed.

  • If the call stack is empty, it takes the first function from the callback queue and pushes it onto the call stack for execution.

  • This process allo...read more

Add your answer
right arrow
Discover HCLTech interview dos and don'ts from real experiences

Q5. Make a set of 6 boxes Responsive in CSS

Ans.

Use CSS to make a set of 6 boxes responsive

  • Use percentage or viewport units for width and height

  • Use media queries to adjust styles for different screen sizes

  • Consider using flexbox or grid for layout

  • Avoid using fixed pixel values

  • Test on different devices and browsers

  • Use CSS frameworks like Bootstrap or Foundation for easier implementation

Add your answer
right arrow

Q6. Write a program 1 to 100 prime numbers

Ans.

Generate an array of prime numbers from 1 to 100.

  • Iterate from 1 to 100 and check if each number is prime

  • A prime number is only divisible by 1 and itself

  • Start with a list of prime numbers and check divisibility

Add your answer
right arrow
Are these interview questions helpful?

Q7. What is hosting in Javascript

Ans.

Hosting in JavaScript refers to the process of declaring a variable or function before it is used in the code.

  • Hosting allows you to use variables and functions before they are declared in the code.

  • Variables are hoisted to the top of their scope, while functions are fully hoisted.

  • Example: console.log(myVar); var myVar = 10; This will not throw an error because 'myVar' is hoisted to the top of the scope.

View 1 answer
right arrow

Q8. What is mean by dom

Ans.

DOM stands for Document Object Model, which is a programming interface for web documents.

  • DOM is a representation of the structure of a web page, allowing scripts to dynamically access and update the content, structure, and style of the document.

  • It provides a way for scripts to interact with the web page by accessing and manipulating elements like text, images, forms, etc.

  • DOM is platform and language-independent, allowing developers to use it with any programming language that...read more

Add your answer
right arrow
Share interview questions and help millions of jobseekers 🌟
man with laptop

Q9. Explain promise in typescript

Ans.

Promises in TypeScript are objects representing the eventual completion or failure of an asynchronous operation.

  • Promises are used to handle asynchronous operations in a more readable and manageable way.

  • 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: const myPromise = new Promise((resolve, reject) => { ... });

Add your answer
right arrow

Q10. Explain hooks in javascript

Ans.

Hooks in JavaScript are functions that let you use state and other React features without writing a class.

  • Hooks were introduced in React 16.8 to allow functional components to have state and lifecycle methods.

  • useState() is a hook that allows you to add state to functional components.

  • useEffect() is a hook that allows you to perform side effects in functional components.

  • Custom hooks are functions that allow you to reuse stateful logic across multiple components.

Add your answer
right arrow

Q11. Reverse the string

Ans.

Reverse a given string

  • Use built-in methods like split(), reverse(), and join() to reverse the string

  • Alternatively, loop through the string from end to start and build a new reversed string

Add your answer
right arrow
Contribute & help others!
Write a review
Write a review
Share interview
Share interview
Contribute salary
Contribute salary
Add office photos
Add office photos

Interview Process at HCLTech Front end Developer

based on 14 interviews
2 Interview rounds
Resume Shortlist Round
Coding Test Round
View more
interview tips and stories logo
Interview Tips & Stories
Ace your next interview with expert advice and inspiring stories

Top Front end Developer Interview Questions from Similar Companies

TCS Logo
3.7
 • 22 Interview Questions
NeoSOFT Logo
3.7
 • 13 Interview Questions
Infosys Logo
3.6
 • 12 Interview Questions
Amdocs Logo
3.7
 • 10 Interview Questions
Zepto Logo
3.5
 • 10 Interview Questions
View all
Recently Viewed
INTERVIEWS
Bharti Airtel
No Interviews
INTERVIEWS
Bharti Airtel
No Interviews
INTERVIEWS
Reliance Communications
No Interviews
INTERVIEWS
HCLTech
No Interviews
INTERVIEWS
ZeMoSo Technologies
No Interviews
INTERVIEWS
Societe Generale Global Solution Centre
No Interviews
INTERVIEWS
AmbitionBox
10 top interview questions
INTERVIEWS
Wipro
100 top interview questions
INTERVIEWS
Capgemini
10 top interview questions
INTERVIEWS
Accenture
10 top interview questions
Share an Interview
Stay ahead in your career. Get AmbitionBox app
play-icon
play-icon
qr-code
Helping over 1 Crore job seekers every month in choosing their right fit company
75 Lakh+

Reviews

5 Lakh+

Interviews

4 Crore+

Salaries

1 Cr+

Users/Month

Contribute to help millions

Made with ❤️ in India. Trademarks belong to their respective owners. All rights reserved © 2024 Info Edge (India) Ltd.

Follow us
  • Youtube
  • Instagram
  • LinkedIn
  • Facebook
  • Twitter