TCS React Js Frontend Developer Interview Questions, Process, and Tips

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...read more
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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...read more
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Complex it is not expected hard Interview

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
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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;
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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.
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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
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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
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Call an API and show in tabular format with all required css