React Js Interview Questions And Answers 2018
React JS Interview Questions and Answers for 2018
React Js Interview Questions And Answers 2018
React JS Interview Questions and Answers 2018 provide a comprehensive overview of the latest concepts and best practices in React development. They help candidates demonstrate their understanding of key React principles, such as component lifecycle, state management, and rendering, as well as their proficiency in specific technologies like Redux, React Router, and performance optimization techniques. These questions ensure that candidates are up-to-date with the evolving React ecosystem and possess the skills necessary to build scalable and performant React applications.
To Download Our Brochure: https://www.justacademy.co/download-brochure-for-free
Message us for more information: +91 9987184296
1 - Explain the concept of virtual DOM in React:
Virtual DOM is a lightweight representation of the actual DOM, created by React to track changes and efficiently update the UI.
2) Describe the differences between props and state in React:
Props are immutable data passed to a component from its parent, while state is mutable data that is managed within the component itself.
3) Explain the role of the “this” keyword in a React component method:
“this” refers to the instance of the component and can be used to access its properties and methods.
4) Describe the difference between controlled and uncontrolled components:
Controlled components have their value managed by React, while uncontrolled components have their value managed by the DOM.
5) Explain the purpose of the “key” prop in a React list:
The “key” prop uniquely identifies each element in a list, allowing React to efficiently track and update the list as elements are added, removed, or changed.
6) Describe how to handle conditional rendering in React:
Use the ternary operator or the && operator to conditionally render different elements based on a condition.
7) Explain the purpose of React hooks:
Hooks are functions that allow you to access React state and lifecycle methods without having to write a class component.
8) Describe how to perform asynchronous operations in React:
Use lifecycle methods like componentDidMount() or APIs like fetch() to handle asynchronous operations.
9) Explain the concept of Redux and how it is used in React:
Redux is a state management library that provides a centralized store for managing application state and ensuring consistency across components.
10) Describe the difference between React Native and React:
React Native is a framework for building mobile applications using React, while React is primarily used for building web applications.
11 - Explain the importance of using a linter in React:
A linter helps enforce code style and best practices, making code more readable, consistent, and error free.
12) Describe the purpose of the React Developer Tools:
The React Developer Tools is a browser extension that provides insights into the structure and state of React components, including the ability to inspect the virtual DOM.
13) Explain how to handle errors in React:
Use the try catch block or the ErrorBoundary component to handle errors and provide a user friendly error message.
14) Describe the best practices for optimizing React applications:
Use memoization, code splitting, and lazy loading to improve performance.
15) Explain the concept of React portals and their use cases:
React portals allow you to render a component outside of its parent's DOM hierarchy, enabling features like modal windows or tooltips.
Earn Points through Active Participation:
- Ask questions: Engage in discussions and demonstrate your knowledge.
- Answer questions:* Share your expertise and help others.
- Comment on posts:* Provide insightful or thoughtful perspectives on discussions.
- Upvote valuable content:* Recognize high quality contributions.
- Start discussions:* Initiate thought provoking conversations on relevant topics.
- Share external resources:* Provide valuable links or articles that contribute to discussions.
- Maximize Point Value:
- Focus on quality over quantity:* Don't prioritize posting for points, but aim to provide valuable insights.
- Respond to popular discussions:* Engage in threads with a high number of views or participants.
- Time your contributions:* Post during peak hours when more users are online.
- Use relevant keywords and hashtags:* Ensure your content is easily discoverable by using appropriate search terms.
- Avoid spamming or self promotion:* Respect community guidelines and avoid posting irrelevant or promotional content.
- Additional Ways to Get Points:
- Complete profile and verify email:* Verify your identity to earn bonus points.
- Invite friends or followers:* Share referral links to earn points for each person who joins through your invitation.
- Participate in contests or giveaways:* Engage in special events or promotions for opportunities to earn extra points.
- Contribute to the community:* Volunteer to moderate discussions, create a resource guide, or assist in other community building initiatives.
- Note: Point systems may vary across different platforms or communities. Check the specific guidelines for the platform you are using to ensure you are earning points effectively.
- Course Overview
- Master the technical interview and land your dream React JS role with this comprehensive course. Gain in-depth knowledge of essential concepts, test your skills with interactive quizzes, and prepare for common interview scenarios with expert guidance.
- Course Description
- Master the latest React JS interview questions and answers for 2018 in this comprehensive course. Covering essential concepts, performance optimization, and advanced topics, it equips you with the knowledge and confidence to excel in technical interviews.
- Key Features
- 1 - Comprehensive Tool Coverage: Provides hands-on training with a range of industry-standard testing tools, including Selenium, JIRA, LoadRunner, and TestRail.
- 2) Practical Exercises: Features real-world exercises and case studies to apply tools in various testing scenarios.
- 3) Interactive Learning: Includes interactive sessions with industry experts for personalized feedback and guidance.
- 4) Detailed Tutorials: Offers extensive tutorials and documentation on tool functionalities and best practices.
- 5) Advanced Techniques: Covers both fundamental and advanced techniques for using testing tools effectively.
- 6) Data Visualization: Integrates tools for visualizing test metrics and results, enhancing data interpretation and decision-making.
- 7) Tool Integration: Teaches how to integrate testing tools into the software development lifecycle for streamlined workflows.
- 8) Project-Based Learning: Focuses on project-based learning to build practical skills and create a portfolio of completed tasks.
- 9) Career Support: Provides resources and support for applying learned skills to real-world job scenarios, including resume building and interview preparation.
- 10) Up-to-Date Content: Ensures that course materials reflect the latest industry standards and tool updates.
Benefits of taking our course
Functional Tools
1 - React JS:
A JavaScript library for building user interfaces
Allows developers to create reusable components
Uses a declarative approach for defining the user interface
Maintains state and allows for efficient updates
2) JavaScript:
A scripting language used in web development
Enables the creation of interactive web pages
Provides a runtime environment for executing code
3) HTML:
A markup language used to structure web pages
Defines the layout and content of the page
4) CSS:
A stylesheet language used to define the presentation of web pages
Controls the appearance, size, and positioning of elements
5) Node.js:
A JavaScript runtime environment
Allows developers to create server side applications and web services
Facilitates the creation of back end functionality for React JS applications
- Attend class regularly and participate in discussions. This shows that you're engaged in the material and are willing to contribute to the class. It also gives you the opportunity to ask questions and get clarification on anything you don't understand.
- Study hard for exams and quizzes.* This is the most important way to improve your grades. Make sure you understand the material and can apply it to new situations.
- Complete all assignments on time.* This shows that you're organized and responsible. It also gives you the opportunity to practice what you've learned.
- Go to office hours to get help from your professor or TA.* This is a great way to get extra help with the material and ask questions you may not be comfortable asking in class.
- Form study groups with other students.* This can help you to stay motivated and learn from others.
- Take advantage of tutoring services.* If you're struggling in a class, tutoring can help you to get back on track.
- Get involved in extracurricular activities.* This can help you to develop skills that will be useful in your career, such as leadership, teamwork, and communication.
- Make connections with people in your field.* This can help you to find internships, jobs, and other opportunities.
- Never give up.* No matter how difficult your classes may seem, don't give up. With hard work and dedication, you can achieve your goals.
Browse our course links : https://www.justacademy.co/all-courses
To Join our FREE DEMO Session: Click Here
This information is sourced from JustAcademy
Contact Info:
Roshan Chaturvedi
Message us on Whatsapp:
Email id: info@justacademy.co
Cognizant Interview Experience React Js
