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I applied via Naukri.com and was interviewed in Apr 2024. There were 3 interview rounds.
Having strong foundations in React involves understanding key concepts like components, state, props, and lifecycle methods.
Understand the concept of components and how they work in React
Learn about state and props and how they are used to manage data and pass information between components
Familiarize yourself with React's lifecycle methods and how they allow you to perform actions at different stages of a component's
Basic questions asked
A nearly two-hour online MCQ test that includes coding on a notepad, situational questions, English proficiency, and standard concept-based MCQs.
I applied via Naukri.com and was interviewed in May 2023. There were 4 interview rounds.
The link was shared and there where a mix of questions, From all sorts of fields to make a profile about candidate.
I cleared coding test consist of 20 mcq related to ReactJs
Vanilla Networks interview questions for designations
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I applied via Naukri.com and was interviewed in Dec 2022. There were 2 interview rounds.
Fragments in React.js are used to group multiple elements without adding an extra node to the DOM.
Fragments are a way to group multiple elements without using a wrapper element.
They help in avoiding unnecessary divs in the DOM.
Fragments can improve performance by reducing the number of DOM nodes.
They are useful when returning multiple elements from a component's render method.
Fragments can be written using the
I applied via LinkedIn and was interviewed in Oct 2024. There was 1 interview round.
React offers advantages such as virtual DOM for improved performance, reusable components, and easy integration with other libraries.
Virtual DOM for efficient updates and improved performance
Reusable components for easier development and maintenance
Easy integration with other libraries like Redux for state management
Support for server-side rendering for better SEO performance
Performance optimization in React Js can be achieved through code splitting, memoization, virtualization, and minimizing re-renders.
Implement code splitting to load only necessary components when needed
Use memoization techniques like useMemo and useCallback to prevent unnecessary re-renders
Implement virtualization for long lists or tables to render only visible items
Minimize re-renders by using shouldComponentUpdate or
useMemo and useCallback are hooks in React used for optimizing performance by memoizing values and functions respectively.
useMemo is used to memoize the result of a function so that it is only recomputed when its dependencies change.
useCallback is used to memoize a function instance so that it is not recreated on every render unless its dependencies change.
Both hooks help in optimizing performance by preventing unneces...
useSelector is a hook provided by React-Redux for accessing the Redux store state in functional components.
Allows functional components to access the Redux store state without connecting to the store
Accepts a selector function as an argument to specify which part of the state to extract
Automatically subscribes to the Redux store updates and re-renders the component when the selected state changes
Optimization in React involves improving performance and efficiency of the application.
Use shouldComponentUpdate or PureComponent to prevent unnecessary re-renders
Avoid using inline functions in render method to prevent re-renders
Use keys in lists to help React identify which items have changed
Splitting components into smaller ones can improve performance
Use React.memo for functional components to memoize the result
JSX is a syntax extension for JavaScript used in React to write HTML-like code within JavaScript.
JSX allows developers to write HTML-like code directly in their JavaScript files
It makes the code more readable and easier to understand
JSX gets transpiled into regular JavaScript by tools like Babel before being rendered by the browser
Redux flow in React involves actions, reducers, store, and components to manage state in a centralized manner.
Actions are dispatched to describe what happened in the application.
Reducers specify how the state changes in response to actions.
Store holds the state of the application.
Components can connect to the store to access and update the state.
I applied via Approached by Company and was interviewed in Jul 2024. There was 1 interview round.
Developed a web application for managing inventory and sales
Used Reactjs for front-end development
Implemented Redux for state management
Integrated with backend APIs using Axios
Designed responsive UI for better user experience
Ternary operator is a shorthand for if else statement in JavaScript.
Ternary operator is written as condition ? expression1 : expression2
If the condition is true, expression1 is executed, else expression2 is executed
Ternary operator is more concise and can be used inline in JSX
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