TCS Front end Developer Interview Questions and Answers

Q1. React Life cycle
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Q2. What React hooks have you utilized in your projects?
Ans. 
I have utilized useState, useEffect, useContext, and useRef hooks in my projects.
• useState - for managing state in functional components

• useEffect - for handling side effects in functional components

• useContext - for accessing context in functional components

• useRef - for accessing DOM elements or storing mutable values
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Q3. What is Redux, and what are the differences between Redux and Context?
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Redux is a predictable state container for JavaScript apps. It helps manage the state of an application in a centralized way.
• Redux is a state management library commonly used with React to manage the state of an application.

• It follows a unidirectional data flow pattern, where the state is stored in a single store and changes are made through actions and reducers.

• Redux allows for a more structured way of managing state ...read more
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Q4. What is the difference between visibility: hidden and display: none in CSS?
Ans. 
visibility: hidden hides an element but still takes up space, while display: none hides an element and removes it from the flow of the document.
• visibility: hidden hides the element but it still occupies space on the page

• display: none hides the element and removes it from the document flow

• visibility: hidden elements are still rendered, just not visible

• display: none elements are not rendered at all
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Q5. What are JavaScript closures, the temporal dead zone (TDZ), hoisting, and the JavaScript engine?
Ans. 
JavaScript closures, TDZ, hoisting, and the JavaScript engine are key concepts in understanding how JavaScript works.
• JavaScript closures are functions that have access to variables from their outer scope even after the outer function has finished executing.

• Temporal Dead Zone (TDZ) is the period between entering a scope and the variable being declared where accessing the variable results in a ReferenceError.

• Hoisting is ...read more
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Identify the duplicate character in the string.

Q1. Explain about react js?
Ans. 
React JS is a JavaScript library for building user interfaces.
• React is component-based, allowing for reusable UI elements.

• Uses a virtual DOM for efficient updates to the actual DOM.

• Supports server-side rendering for improved performance.

• Uses JSX syntax to write HTML within JavaScript code.

• State management is handled using props and state.
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Q2. Explain about angular?
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Angular is a popular front-end framework developed by Google for building dynamic web applications.
• Angular is based on TypeScript, a superset of JavaScript.

• It uses a component-based architecture for building reusable UI components.

• Angular provides features like data binding, dependency injection, and routing.

• It has a powerful CLI for scaffolding and managing projects.

• Angular has a large ecosystem of libraries and tools...read more
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Q1. What is api? Application programming interface collect the backend data show the UI
Ans. 
API stands for Application Programming Interface. It is a set of rules and protocols that allows different software applications to communicate with each other.
• APIs define the methods and data formats that applications can use to request and exchange information.

• They allow developers to access the functionality of a system or service without needing to understand its internal workings.

• Examples of APIs include Google Ma...read more
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Q2. What is state and props
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State and props are two important concepts in React for managing and passing data between components.
• State is used to store and manage data within a component. It is mutable and can be updated using setState() method.

• Props (short for properties) are used to pass data from parent to child components. They are immutable.

• State is internal to a component, while props are external and passed down from parent components.

• Exam...read more
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Add number as string along with basics react questions.