Basic React Js Interview Questions
Core React.js Interview Questions
Basic React Js Interview Questions
React JS is a popular front-end library for building user interfaces. It is widely used due to its component-based architecture, which allows for easy reusability and maintainability of code. React JS interview questions often cover topics such as component lifecycle, state management, and data fetching, as these concepts are essential for understanding how React JS works and how to use it effectively.
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1 - What is JSX?
JSX (JavaScript XML) is a syntax extension to JavaScript that allows developers to write React elements using XML like syntax.
2) What is the difference between props and state?
Props are immutable properties passed to a component from its parent, while state is internal and mutable and can be updated within the component.
3) What is the purpose of the `render` method?
The `render` method is where the UI of a React component is defined. It returns a React element that represents the component's current state.
4) What is a component lifecycle?
The component lifecycle refers to the sequence of methods that are called throughout the existence of a React component, such as `componentDidMount`, `componentWillUnmount`, etc.
5) What is the difference between class components and functional components?
Class components use the ES6 class syntax, while functional components are defined as arrow functions or regular JavaScript functions. The main difference is that class components can have state, while functional components cannot.
6) What is a controlled component?
A controlled component is an input field whose value is managed by the state of a React component.
7) What is uncontrolled component?
An uncontrolled component is an input field whose value is managed by the DOM itself.
8) What is the Virtual DOM?
The Virtual DOM is a lightweight representation of the actual DOM that React uses to efficiently update the UI.
9) What is the purpose of the `useEffect` hook?
The `useEffect` hook allows developers to perform side effects, such as fetching data or setting up event listeners, in a React component.
10) What is the difference between the `useEffect` and `useCallback` hooks?
The `useEffect` hook is used for side effects that may change over time, while the `useCallback` hook is used to create memoized callback functions.
11 - What is the purpose of the `useContext` hook?
The `useContext` hook allows developers to access the context object from anywhere in a React component without having to pass it explicitly through props.
12) What is the purpose of the `useReducer` hook?
The `useReducer` hook provides an alternative to the `useState` hook for managing state that is more complex or requires custom logic.
13) What are some best practices for writing React components?
Some best practices for writing React components include using a consistent coding style, separating components into small and reusable chunks, following the DRY (Don't Repeat Yourself) principle, and using type checking to catch errors early.
14) What are some common mistakes to avoid when writing React apps?
Some common mistakes to avoid when writing React apps include overusing the `setState` method, not using the `useEffect` hook correctly, not using the `Virtual DOM` efficiently, and not handling errors properly.
15) What are the future trends in React development?
Some future trends in React development include the increased use of TypeScript, the adoption of the new hooks API, and the integration of React with other technologies, such as GraphQL.
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- Course Overview
- This course covers essential React JS interview questions for entry-level and experienced developers. It provides an overview of React concepts and best practices, including component lifecycle, state management, and data fetching.
- Course Description
- This interview preparation course introduces candidates to the fundamental React JS concepts frequently encountered in technical interviews. It covers topics such as component lifecycle, state management, event handling, and testing techniques.
- 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:
- React JS (JavaScript library): A front end library for building dynamic and interactive web applications.
- 2. Node.js (JavaScript runtime environment): Provides the ability to run JavaScript on the server side, enabling full stack development.
- 3. Express.js (web framework for Node.js): Facilitates the creation of web applications and APIs, providing routing, middleware, and templating capabilities.
- 4. MongoDB (NoSQL database): A document oriented database that stores data in JSON like documents, offering flexibility and scalability.
- 5. RESTful APIs (application programming interfaces): A set of architectural constraints that define how a client and a server interact, ensuring interoperability and reusability.
- 6. CI/CD (continuous integration and continuous delivery): A set of practices that enable automated testing, code deployment, and application maintenance, ensuring a smooth and efficient development process.
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