TCS Senior Software Engineer Interview Questions, Process, and Tips

Class components are ES6 classes while functional components are functions.

• Class components have state and lifecycle methods while functional components don't.

• Functional components are simpler and easier to read and test.

• Functional components are preferred for simple UI components while class components are used for complex UI components.

• Example of class component: class MyComponent extends React.Component {}

• Example of...read more

Hooks are a feature in React that allow functional components to have state and lifecycle methods.

• Hooks were introduced in React 16.8

• useState is a hook that allows functional components to have state

• useEffect is a hook that allows functional components to have lifecycle methods

• Custom hooks can be created to reuse stateful logic across components

Fetch API is a built-in web API in modern browsers used to make HTTP requests from the browser to the server.

• Fetch API is used to make asynchronous HTTP requests from the browser to the server.

• It returns a Promise that resolves to the Response object representing the response to the request.

• It can be used with React to fetch data from an API and update the state of a component.

• Fetch API can be used with different HTTP ...read more

componentDidMount is called after the component is mounted while componentWillMount is called before the component is mounted.

• componentDidMount is used for fetching data from APIs and updating the state

• componentWillMount is used for setting the initial state and making preparations for rendering

• componentDidMount is called once while componentWillMount is called multiple times

• componentDidMount is used for DOM manipulati...read more

Strict mode is a feature in React that helps with debugging and identifying potential issues.

• Enables additional checks and warnings during development

• Helps identify unsafe code and deprecated features

• Can be enabled globally or for specific components

• Example:

State is mutable data owned by a component, while props are immutable data passed to a component.

• State can be changed by the component itself, while props cannot be changed by the component

• State is used to store data that can change over time, while props are used to pass data from parent to child components

• State is initialized in the constructor of a component, while props are passed down from the parent component

• Exam...read more

Yes, I have worked on Bootstrap extensively.

• I have used Bootstrap to create responsive and mobile-first web pages.

• I have utilized Bootstrap's grid system, components, and utilities to design and develop web applications.

• I have customized Bootstrap's CSS and JavaScript to meet specific project requirements.

• I have integrated Bootstrap with other front-end frameworks and libraries such as React and jQuery.

• I have also cont...read more

Security tools for React applications

• Use ESLint and Prettier to enforce code quality and security standards

• Implement authentication and authorization using libraries like Passport.js and JSON Web Tokens

• Use security-focused libraries like Helmet to secure HTTP headers

• Implement input validation and sanitization using libraries like Joi and DOMPurify

• Use HTTPS to encrypt data in transit

• Implement rate limiting and other sec...read more

I would rate myself 4 out of 5 in React, HTML, CSS, and JS.

• I have extensive experience in developing web applications using React, HTML, CSS, and JS.

• I have worked on several projects that involved building complex UI components using React.

• I am proficient in writing clean and maintainable code using HTML, CSS, and JS.

• I am familiar with modern front-end development tools and frameworks such as Redux, Webpack, and Babel.

Yes, I am flexible with location and willing to relocate if required.

• I am open to working remotely or on-site

• I am willing to relocate for the right opportunity

• I have experience working with remote teams

Axios is a promise-based HTTP client for making API requests in ReactJs.

• Axios is used to make HTTP requests from the client-side in ReactJs

• It supports all modern browsers and can be used with Node.js

• Axios can be used to make GET, POST, PUT, DELETE requests and more

• It can also handle request and response interceptors for global error handling and authentication

• Axios can be installed using npm or yarn

State management libraries other than Redux

• MobX - simple and scalable state management

• Flux - unidirectional data flow architecture

• Vuex - state management for Vue.js

• Apollo Client - state management for GraphQL

• React Context API - built-in state management for React

• Recoil - experimental state management library for React

• XState - state management for finite state machines

setState is asynchronous

• setState schedules an update to a component's state

• The update may not happen immediately, but will be batched and executed later

• This can lead to unexpected behavior if not handled properly