React Js Interview Questions 2020
React JS Interview Questions and Answers for 2020
React Js Interview Questions 2020
React JS interview questions 2020 are important for aspiring front-end developers seeking employment opportunities. These questions assess candidates' knowledge of React concepts such as state management, component lifecycle, performance optimization techniques, and their ability to apply React principles in real-world development scenarios. By preparing for these questions, candidates demonstrate their expertise and readiness to contribute effectively to development teams.
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1 - Explain the concept of React hooks: Hooks are functions that let you hook into React's state and lifecycle features without writing a class.
2) Describe the virtual DOM in React: The virtual DOM is a lightweight representation of the real DOM, which React uses to efficiently update the UI by only re rendering the components that have changed.
3) What is the difference between props and state in React? Props are immutable properties passed down from parent to child components, while state is mutable and can be updated within a component.
4) How do you handle asynchronous operations in React? You can use async/await, Promises, or the useEffect lifecycle hook to handle asynchronous operations.
5) Explain how React handles routing: React uses the react router library to handle routing and navigation between different components.
6) What is the Redux pattern and how is it used with React? Redux is a state management pattern used to manage global application state in React applications.
7) How do you handle data fetching and caching in React? You can use the fetch API, Axios library, or GraphQL to fetch data. Caching mechanisms like Redux or local storage can be used to optimize performance.
8) Explain the concept of context in React: Context provides a way to share data between components without explicitly passing it through props.
9) What are some best practices for optimizing React applications? Use memoization, lazy loading, code splitting, and the React Profiler tool.
10) Describe the lifecycle of a React component: The lifecycle includes mounting (initial render), updating (state or props changes), and unmounting (component removal).
11 - Explain the difference between function components and class components: Function components are stateless and defined as functions, while class components are stateful and defined using classes.
12) How do you use React for server side rendering? You can use React with Node.js and libraries like Next.js to perform server side rendering.
13) What is the purpose of the render props pattern? Render props allow you to pass a function as a prop to another component, giving the child component control over the rendering process.
14) Explain how to use React refs: Refs are used to access DOM elements or React instances directly.
15) What are the advantages of using React over other frameworks? React offers a declarative programming style, high performance, strong community support, and a wide range of ecosystem tools.
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- Course Overview
- Learn React JS interview questions and answers for 2020. This course covers key concepts, data flow, components, hooks, state management, performance optimization, and best practices. Master React JS interview techniques, with hands-on practice and real-world examples, to ace your next interview.
- Course Description
- This course prepares candidates for React JS interviews by equipping them with in-depth knowledge of essential concepts, including Hooks, Context API, Redux, performance optimization, and testing techniques. Covering the latest interview questions and trends, it empowers candidates to showcase their proficiency in React and secure their dream job.
- 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
Tools Used in the Course “React JS Interview Questions 2020”:
- React: Open source JavaScript library for building user interfaces. It facilitates the creation of reusable components and simplifies state management, making it ideal for building complex and interactive web applications.
- 2. Redux: Predictable state container for JavaScript applications. It allows you to manage and update the application state in a central location, ensuring consistency and predictability in state changes.
- 3. JavaScript: Dynamic and versatile programming language used for creating web applications. It supports object oriented programming, asynchronous programming, and modern web APIs.
- 4. Node.js: Open source JavaScript runtime environment that enables the execution of JavaScript code outside of a browser. It allows you to create server side applications and build REST APIs.
- 5. webpack: Module bundler for JavaScript applications that compiles, optimizes, and bundles JavaScript modules. It plays a crucial role in managing dependencies and reducing the size of the application's final output.
- 6. Babel: JavaScript transpiler that converts modern JavaScript syntax into older, more compatible syntax. It supports the latest features of JavaScript while ensuring backward compatibility with older browsers.
- Training Program for Students:
- Course Objectives:
- Gain a comprehensive understanding of React JS fundamentals and advanced concepts.
- * Master state management using Redux.
- * Develop proficiency in JavaScript programming and web APIs.
- * Learn to build production grade React JS applications.
- * Prepare for React JS interview questions.
- Course Modules:
- * Introduction to React JS
- * Creating React Components
- * Managing State with Redux
- * JavaScript Fundamentals and Best Practices
- * Node.js and Web APIs
- * React JS Application Development
- Benefits:
- Career Advancement:* Enhance your qualifications for React JS development roles.
- Practical Skills:* Gain hands on experience in building React applications.
- Expert Guidance:* Learn from experienced instructors with industry knowledge.
- Personalized Learning:* Adjust the training pace and duration to suit your schedule.
- Job Assistance:* Receive support in resume writing, interview preparation, and job placement.
- Answer questions accurately and thoroughly.* This is the most important thing you can do to get more points. Make sure your answers are well written and free of errors.
- Up vote the answers of others.* This shows that you appreciate their work and helps to build a sense of community.
- Ask questions that are interesting and relevant to the community.* This will help to attract attention to your questions and get you more answers.
- Be active in the community.* This means participating in discussions, commenting on questions, and up voting answers. The more active you are, the more points you will earn.
- Use the search bar before asking a question.* This will help to avoid duplicate questions and save you time.
- Follow the community guidelines.* This will help to ensure that your questions and answers are appropriate and respectful.
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