React Js Basics Interview Questions And Answers
React JS Basic Interview Questions and Answers: A Comprehensive Guide
React Js Basics Interview Questions And Answers
React JS is a JavaScript library used for building user interfaces. It is widely used due to its declarative programming model, component-based architecture, and efficient performance optimization techniques. Understanding React JS basics is crucial in interviews as it showcases a candidate's knowledge of core concepts, such as state management, lifecycle methods, functional components, and props, which are essential for developing dynamic and interactive web applications.
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1 - What is React JS?
React JS is a JavaScript library for building user interfaces.
2) What are the key concepts of React?
Components: Reusable UI building blocks
State: Data that describes the component's current state
Props: Input data that components receive from their parents
3) What is JSX?
JSX is a JavaScript syntax extension that allows us to write React elements in HTML like syntax.
4) What is a virtual DOM?
A virtual DOM is a lightweight representation of the actual DOM, which React uses to compare and update only the necessary elements, improving performance.
5) What is the difference between props and state?
Props are immutable and come from outside the component, while state is mutable and is managed within the component.
6) What are lifecycle methods?
Lifecycle methods are functions that are invoked at different stages of a component's lifecycle, allowing us to perform actions like mounting, updating, and unmounting.
7) What is a controlled component?
A controlled component is an input element whose value is managed by the React state rather than by the HTML form state.
8) What is a key in React?
A key is a unique identifier for each element in a list, which helps React track and update elements efficiently.
9) What is the purpose of the `useEffect` hook?
The `useEffect` hook is used to perform side effects, such as fetching data, handling subscriptions, or updating the DOM, after a component has been rendered.
10) What is the React Router?
React Router is a third party library that provides declarative routing for React applications, allowing us to navigate between different URLs and views.
11 - What is Redux?
Redux is a state management library for React applications, which provides a centralized store for maintaining and managing the application's state.
12) What are the benefits of using a state management library like Redux?
Centralized state: All application state is stored in a single location.
Predictable state changes: State updates follow a predictable pattern, making it easier to debug and reason about the application's behavior.
Time travel debugging: Redux provides the ability to track and replay state changes, allowing developers to debug complex interactions more easily.
13) What is the difference between `shallow` and `deep` rendering in React?
Shallow rendering: Only the current component and its direct children are re rendered.
Deep rendering: The current component and all of its subcomponents are re rendered.
14) What is the purpose of the `shouldComponentUpdate` lifecycle method?
The `shouldComponentUpdate` method can be used to optimize rendering performance by preventing unnecessary updates.
15) What are the best practices for writing efficient React applications?
Use the virtual DOM and immutable data structures.
Use keys for list items.
Use memoization.
Use the `shouldComponentUpdate` lifecycle method.
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- Follow other users.* When you follow other users, you'll earn points for each new post they make. You can also earn points for liking and commenting on their posts.
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- Course Overview
- This course provides a comprehensive overview of fundamental React JS interview questions and their corresponding answers, empowering candidates to excel in technical interviews.
- Course Description
- This course covers fundamental React JS concepts, including components, state management, props, and hooks, through a series of interview-style questions and comprehensive answers. It provides comprehensive preparation for React JS job interviews, equipping learners with the knowledge and confidence to excel in these assessments.
- 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
- React.js: A JavaScript library for building user interfaces. It uses a declarative approach, making it easier to create and maintain complex UIs.
- 2. JavaScript: The programming language used to create web applications. It is a client side language, meaning it runs in the user's browser.
- 3. HTML: The markup language used to structure web pages. It defines the content and layout of a web page.
- 4. CSS: The style sheet language used to style web pages. It defines the appearance of a web page, including its fonts, colors, and layout.
- 5. Node.js: A JavaScript runtime environment that allows JavaScript to be run on the server side. It is used to create web servers and other server side applications.
- 6. MongoDB: A database management system that stores data in documents. It is a NoSQL database, meaning it does not use a traditional relational model.
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- Collaborate with others:* Team up with influencers or related businesses to cross promote content.
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