Interview Questions Of React Js
Common React JS Interview Questions
Interview Questions Of React Js
Interview questions for React JS are designed to assess a candidate's knowledge of React's core concepts, such as its declarative nature, component-based architecture, and state management techniques. They also evaluate the candidate's ability to apply React in real-world scenarios, optimize performance, and troubleshoot common issues. By asking in-depth questions about React's functionalities and principles, interviewers aim to determine the candidate's proficiency in this essential JavaScript library and their capacity to contribute effectively to React-based projects.
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1 - Explain the Virtual DOM in React.
A lightweight representation of the real DOM that React uses to optimize updates efficiently.
2) What is the purpose of the “setState” method?
Triggers a re render of the affected component when an object of updated properties is passed to it.
3) Describe the difference between “props” and “state”.
Props are immutable inputs passed down from a parent component, while state is mutable data stored within a component.
4) How do you handle asynchronous operations in React?
Using Promises, Async/Await, or the useEffect hook with an empty dependency array (for side effects on component mount).
5) Explain the role of the “useEffect” hook.
Allows for side effects like fetching data or setting up subscriptions, and is invoked on component mount, update, or unmount.
6) What are the benefits of using hooks in React?
Hooks provide a clean and concise way to manage state and side effects without the need for class components.
7) Describe the “React Router” for navigation.
A library that enables dynamic navigation between different views or components within a React application.
8) Explain the importance of “keys” for list items in React.
Keys uniquely identify each list item, allowing React to efficiently manage updates and avoid unnecessary re renders.
9) How do you debug React applications?
Use browser developer tools, React DevTools extension, error boundaries, and logging to identify and resolve issues.
10) What is the purpose of the “shouldComponentUpdate” lifecycle method?
Allows optimization by preventing unnecessary re renders when the component state or props have not changed significantly.
11 - Describe the “Redux” library for state management.
A state management pattern that maintains a centralized store for the entire application, allowing for better organization and data management.
12) Explain the concept of “higher order components” (HOCs).
Functions that accept components as their input and return enhanced versions with additional functionality or shared behavior.
13) What is the “context” API in React?
A mechanism for passing data between deeply nested components without having to explicitly pass props through each level.
14) Describe the “React Fiber” architecture.
The underlying reconciliation engine in React that optimizes rendering performance by splitting it into smaller tasks.
15) Explain the “portal” feature in React.
Allows rendering of a component into a different part of the DOM, enabling complex UI patterns like modals or overlays.
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- Course Overview
- This interview questions of React JS course provides a comprehensive overview of the key concepts and technologies used in building web applications with React JS. It covers essential topics such as component architecture, state management, performance optimization, testing, and advanced routing techniques. Whether you're a seasoned developer or just getting started with React JS, this course will equip you with the knowledge and skills needed to excel in React JS interviews.
- Course Description
- This course provides a comprehensive overview of the most commonly asked interview questions for React JS, covering essential concepts such as component lifecycle, state management, hooks, and advanced topics. It prepares learners to confidently answer technical and behavioral questions, enabling them to ace their React JS interviews.
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- 1 - Comprehensive Tool Coverage: Provides hands-on training with a range of industry-standard testing tools, including Selenium, JIRA, LoadRunner, and TestRail.
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Benefits of taking our course
Functional Tools
1 - React Developer Tools: A Chrome extension that provides insights into the React component hierarchy, props, state, and performance. It allows developers to inspect the application state and make real time changes.
2) Redux DevTools: A similar extension that focuses on tracking the Redux state management system. It enables developers to visualize the changes in the store and identify potential issues.
3) Jest: A testing framework specifically designed for React applications. It allows developers to create unit and integration tests to ensure the correct functionality of the code.
4) Enzyme: A React testing utility library that provides a set of helpers for writing shallow and full rendering unit tests. It simplifies the process of creating test cases and mock objects.
5) Create React App: A tool that sets up a new React project with pre configured dependencies, such as Babel, Webpack, and Jest. It streamlines the development workflow and enables developers to start building applications quickly.
6) React Hot Loader: A tool that allows developers to make changes to their React code while the application is running. This enables rapid prototyping and reduces the time required for iteration.
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