Tata Play Interview Questions and Answers

JavaScript concepts like event loop, variable hoisting, and closures are fundamental for understanding the language.

• Event loop is responsible for managing the execution of code in JavaScript, ensuring non-blocking behavior.

• Variable hoisting allows variables to be declared anywhere in a function, with their declarations moved to the top during compilation.

• Closures allow functions to access variables from their outer scope even after the outer function has finished executing.

Experience with Redux for state management and data flow

• Used Redux for managing state in complex web applications

• Understand concepts like actions, reducers, and store in Redux

• Data flows in a unidirectional manner within Redux, with actions triggering state changes through reducers

• Example: Dispatching an action to update a user's profile information in Redux store

Optimizing React application performance through various strategies.

• Code splitting to reduce initial load time

• Using shouldComponentUpdate or React.memo for efficient rendering

• Implementing virtualized lists for large data sets

• Minifying and compressing assets for faster loading

• Caching data with tools like Redux or useMemo

Code assignment to fetch data from API & DOM manipulation using state management libraries

• Use fetch API to make a request to the desired endpoint

• Utilize state management libraries like Redux or MobX for managing data

• Update the DOM based on the fetched data using the state management library

Implement field validation in a form using code assignment

• Use HTML form elements like input, select, textarea

• Use JavaScript to validate user input

• Display error messages if validation fails

• Consider using libraries like jQuery Validation for complex validations