React JS Interview Question and Answer
React.js Interview Questions and Answers
React JS Interview Question and Answer
React JS, a popular JavaScript library, is designed for building highly responsive and dynamic user interfaces. Its key benefits include its component-based approach, making it easy to create and reuse UI components. React's declarative programming style simplifies code maintenance and enhances readability. Moreover, it empowers developers to use virtual DOM (Document Object Model) for efficient UI updates, resulting in faster and smoother user experiences.
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1 - What is the difference between state and props?
State is data managed within a component, while props are data passed to a component from its parent.
2) What is the purpose of the shouldComponentUpdate life cycle method?
To optimize performance by conditionally deciding when a component needs to re render.
3) Explain the concept of immutability in React.
React requires props and state to be immutable, meaning they cannot be directly changed but must be replaced with new values.
4) What are the key advantages of using React Hooks?
Hooks provide a cleaner and more reusable method of managing state and side effects than class based components.
5) Describe the purpose of the useEffect hook.
The useEffect hook performs side effects in functional components, such as fetching data or setting up subscriptions.
6) What is the difference between controlled and uncontrolled components?
With controlled components, the value is managed by the component's state, while with uncontrolled components, the value is managed by the input element itself.
7) Explain the role of React Router in a React application.
React Router handles navigation between different views or pages in a React application.
8) What are the best practices for optimizing React performance?
Using the shouldComponentUpdate lifecycle method, memoizing components, and avoiding unnecessary re renders.
9) Describe the state management techniques used in React.
React Context API, Redux, and third party libraries like MobX and Zustand.
10) What are the benefits of using a Higher Order Component (HOC)?
HOCs allow you to share common functionality between components without duplicating code.
11 - Explain the concept of conditional rendering in React.
Conditional rendering allows you to conditionally display or hide components based on certain conditions.
12) What is the difference between a Fragment and a Div in React?
Fragments are “invisible” components that can be used to group elements without adding extra DOM nodes, while Divs are actual DOM nodes that impact the layout of the page.
13) Describe the purpose of the render props pattern.
The render props pattern allows you to pass a function that returns React elements as a prop, giving you more control over the rendering process.
14) What is the significance of the virtual DOM in React?
The virtual DOM is a lightweight representation of the actual DOM that allows React to efficiently update the UI by only rendering the necessary changes.
15) Explain how React handles asynchronous operations.
React uses promises, callbacks, async/await, and third party libraries like Axios and Redux Thunk to handle asynchronous operations.
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Functional Tools
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