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TCS React Js Frontend Developer Interview Questions and Answers
17 Interview questions
Use useEffect to fetch API data and display it in a table format in a React component.
Import useEffect and useState from React to manage side effects and state.
Use useEffect to fetch data when the component mounts: useEffect(() => { fetchData(); }, []);
Define an async function inside useEffect to fetch data: const fetchData = async () => { const response = await fetch(apiUrl); const data = await response.jso...
Reversing an array without built-in methods involves swapping elements from both ends towards the center.
Initialize two pointers: one at the start (index 0) and one at the end (last index) of the array.
Swap the elements at these two pointers.
Move the start pointer forward and the end pointer backward.
Repeat the process until the start pointer is greater than or equal to the end pointer.
Example: For an array ['a', ...
Debugger in JavaScript is used for pausing the execution of code to inspect variables, check the flow of the program, and debug errors.
Debugger helps in identifying and fixing bugs in the code.
It allows developers to step through code line by line to understand the flow of execution.
Developers can inspect variables and their values at different points in the code.
By setting breakpoints, developers can pause the co...
React is a JavaScript library for building user interfaces.
React allows for the creation of reusable UI components
It uses a virtual DOM for efficient rendering
React makes it easier to manage state and data flow in applications
What people are saying about TCS
Yes, I have experience in coding optimization to improve performance and efficiency.
Identifying and removing unnecessary code or dependencies
Minifying and compressing code for faster loading times
Using efficient algorithms and data structures
Reducing the number of API calls by batching requests
Implementing lazy loading for resources to improve page load times
Arrow functions are a concise way to write functions in JavaScript.
Arrow functions do not have their own 'this' keyword.
Arrow functions are more concise than traditional function expressions.
Arrow functions do not have their own 'arguments' object.
Arrow functions are best suited for non-method functions.
Example: const add = (a, b) => a + b;
Lazy loading is a technique used in web development to defer loading non-essential resources until they are needed.
Lazy loading helps improve page load times by only loading resources when they are required.
It is commonly used for images, videos, and other media files on websites.
Lazy loading can be implemented using libraries like React.lazy() in React.js.
Conditional rendering in React allows components to render different elements or components based on certain conditions.
Use ternary operator to conditionally render elements
Use logical && operator for conditional rendering
Use if-else statements inside render method for more complex conditions
The toughest functionality I developed was implementing a complex form validation system with dynamic fields and real-time feedback.
Implemented a multi-step form with conditional fields based on user input.
Used React Hook Form for managing form state and validation, which simplified the process.
Integrated Yup for schema validation, allowing for complex validation rules like regex for email formats.
Faced challenges...
useEffect can mimic lifecycle methods by specifying dependencies and cleanup functions.
useEffect can be used to mimic componentDidMount by specifying an empty dependency array.
useEffect can be used to mimic componentDidUpdate by specifying a dependency array.
useEffect can be used to mimic componentWillUnmount by returning a cleanup function.
useEffect can be used to mimic shouldComponentUpdate by using memoization ...
TCS React Js Frontend Developer Interview Experiences
20 interviews found
Anonymous
I applied via Approached by Company and was interviewed in Oct 2024. There was 1 interview round.
(1 Question)
- Q1. Why do we use Debugger in Javascript?
- Ans.
Debugger in JavaScript is used for pausing the execution of code to inspect variables, check the flow of the program, and debug errors.
Debugger helps in identifying and fixing bugs in the code.
It allows developers to step through code line by line to understand the flow of execution.
Developers can inspect variables and their values at different points in the code.
By setting breakpoints, developers can pause the code at...
Skills evaluated in this interview
I applied via Naukri.com and was interviewed in Sep 2024. There was 1 interview round.
(1 Question)
- Q1. What is global state management?
- Ans.
Global state management is a way to manage and share state data across multiple components in a React application.
It helps in avoiding prop drilling by providing a centralized location for storing and updating state.
Common libraries for global state management in React include Redux, Context API, and MobX.
Global state management allows for easier state synchronization between components and can improve performance.
Exam...
I appeared for an interview in Mar 2025, where I was asked the following questions.
- Q1. To write a use Effects method to get api and get response from api and list in table format
- Ans.
Use useEffect to fetch API data and display it in a table format in a React component.
Import useEffect and useState from React to manage side effects and state.
Use useEffect to fetch data when the component mounts: useEffect(() => { fetchData(); }, []);
Define an async function inside useEffect to fetch data: const fetchData = async () => { const response = await fetch(apiUrl); const data = await response.json(); ...
- Q2. To reverse a array without built in methods
- Ans.
Reversing an array without built-in methods involves swapping elements from both ends towards the center.
Initialize two pointers: one at the start (index 0) and one at the end (last index) of the array.
Swap the elements at these two pointers.
Move the start pointer forward and the end pointer backward.
Repeat the process until the start pointer is greater than or equal to the end pointer.
Example: For an array ['a', 'b', ...
I appeared for an interview in Apr 2025, where I was asked the following questions.
- Q1. What is function currying in js?
- Q2. What is deep object in js
Complex it is not expected hard Interview
(5 Questions)
- Q1. What is jsx and es6
- Ans.
JSX is a syntax extension for JavaScript that allows HTML to be written in React components. ES6 is a newer version of JavaScript with additional features.
JSX allows developers to write HTML-like code within JavaScript files
ES6 introduces new syntax and features like arrow functions, classes, and template literals
JSX is transformed into regular JavaScript by tools like Babel before being rendered in the browser
- Q2. What is arrow function
- Ans.
Arrow functions are a concise way to write functions in JavaScript.
Arrow functions do not have their own 'this' keyword.
Arrow functions are more concise than traditional function expressions.
Arrow functions do not have their own 'arguments' object.
Arrow functions are best suited for non-method functions.
Example: const add = (a, b) => a + b;
- Q3. What is lazy loading
- Ans.
Lazy loading is a technique used in web development to defer loading non-essential resources until they are needed.
Lazy loading helps improve page load times by only loading resources when they are required.
It is commonly used for images, videos, and other media files on websites.
Lazy loading can be implemented using libraries like React.lazy() in React.js.
- Q4. Do you know how to code optimize
- Ans.
Yes, I have experience in coding optimization to improve performance and efficiency.
Identifying and removing unnecessary code or dependencies
Minifying and compressing code for faster loading times
Using efficient algorithms and data structures
Reducing the number of API calls by batching requests
Implementing lazy loading for resources to improve page load times
- Q5. Do you know conditional rendering
- Ans.
Conditional rendering in React allows components to render different elements or components based on certain conditions.
Use ternary operator to conditionally render elements
Use logical && operator for conditional rendering
Use if-else statements inside render method for more complex conditions
Skills evaluated in this interview
Sabari K Nair
Call an API and show in tabular format with all required css
Interview Preparation Tips
I applied via Approached by Company
(1 Question)
- Q1. Basics and practical questions related to react.
(1 Question)
- Q1. Questions about implementing Login and solving code related problems.
(1 Question)
- Q1. Salary negotiation
Selected
I applied via Naukri.com and was interviewed in Jun 2024. There was 1 interview round.
(2 Questions)
- Q1. College Project
- Q2. Different front end libraries
- Ans.
Front end libraries are tools used to build user interfaces in web development.
React.js - a popular library for building user interfaces
Angular - a framework for building web applications
Vue.js - a progressive JavaScript framework for building user interfaces
jQuery - a fast, small, and feature-rich JavaScript library
Skills evaluated in this interview
vishnu vardhan
Test went really welll. I have given answer for all the basic questions. ANd then got one DSA question to solve. I have solved it. But they havnt revealed the result for TR1.
I applied via Approached by Company and was interviewed in Feb 2024. There was 1 interview round.
(2 Questions)
- Q1. Basics of JavaScript, HTML, React
- Q2. Performance Optimization
TCS Interview FAQs
Some of the top questions asked at the TCS React Js Frontend Developer interview -
The duration of TCS React Js Frontend Developer interview process can vary, but typically it takes about less than 2 weeks to complete.
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