Top Interview questions for Senion Laravel React Developer.
What is React?
React is a JavaScript library for building user interfaces, developed by Facebook. It allows developers to create reusable UI components and efficiently manage the state of those components.
React is a JavaScript library for building user interfaces, developed by Facebook. It allows developers to create reusable UI components and efficiently manage the state of those components.
What are the key features of React?
Some key features of React include:
Virtual DOM for efficient rendering
Component-based architecture
JSX syntax for combining JavaScript with HTML
One-way data flow
React Native for building mobile applications
How does React differ from other JavaScript frameworks like Angular or Vue?
React follows a component-based architecture, while Angular follows an MVC pattern, and Vue offers a combination of both. React uses a virtual DOM for performance optimization, whereas Angular and Vue have different approaches to handling DOM updates. React primarily focuses on the view layer, while Angular is a complete framework with features like routing and dependency injection.
Explain the concept of JSX.
JSX is a syntax extension for JavaScript that allows developers to write HTML-like code within JavaScript. It makes it easier to create and manipulate React elements, providing a more declarative way to define UI components.
What are components in React?
Components are reusable building blocks in React applications that encapsulate a piece of UI and its behavior. They can be composed together to create complex UIs, making the codebase more modular and easier to maintain.
How do you create a React component?
React components can be created using ES6 classes or functional components. Here's an example of each:
Class component:
jsx
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class MyComponent extends React.Component {
render() {
return <div>Hello, World!</div>;
}
}
Functional component:
jsx
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function MyComponent() {
return <div>Hello, World!</div>;
}
What is state in React?
State in React is an object that represents the data that a component needs to render. It is mutable and can be updated using the setState() method. Changes to state trigger re-rendering of the component.
How do you manage state in React?
State can be managed using the setState() method within class components or using hooks like useState() in functional components. State can also be lifted up to parent components to share data between child components.
What are lifecycle methods in React?
Lifecycle methods are special methods that are invoked at different stages of a component's lifecycle. Some commonly used lifecycle methods include componentDidMount(), componentDidUpdate(), and componentWillUnmount().
How do you handle events in React?
Events in React are handled similarly to native DOM events but using camelCase naming convention. Event handlers are passed as props to JSX elements. For example:
jsx
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function handleClick() {
console.log('Button clicked');
}
<button onClick={handleClick}>Click Me</button>
What is virtual DOM in React?
Virtual DOM is a lightweight copy of the actual DOM. React uses it to improve performance by comparing the virtual DOM with the real DOM and only updating the parts of the DOM that have changed, minimizing the number of actual DOM manipulations.
How do you integrate React with Laravel?
React can be integrated with Laravel by setting up Laravel as a backend API to serve data to a React frontend. This involves creating API endpoints in Laravel to fetch and manipulate data, and using Axios or Fetch API in React to make HTTP requests to these endpoints.
What are the advantages and disadvantages of using React with Laravel?
Advantages:
React provides a more dynamic and interactive user interface.
Laravel offers powerful backend features and RESTful API development.
Disadvantages:
Integration may add complexity to the project setup.
Learning curve for developers who are not familiar with both React and Laravel.
How do you handle authentication and authorization in a React + Laravel application?
Authentication can be implemented using Laravel's built-in authentication system (e.g., Laravel Passport for API authentication) and managing user sessions with React. Authorization can be enforced by validating user permissions on the server-side and controlling access to certain routes or resources.
Can you explain how routing works in React?
React Router is a popular library for client-side routing in React applications. It allows developers to define routes using JSX syntax and renders different components based on the current URL. React Router also provides features like nested routes, route parameters, and programmatic navigation.
16. What are higher-order components (HOCs) in React?
Higher-order components are functions that take a component and return a new enhanced component with additional functionality. They are commonly used for code reuse, logic abstraction, and cross-cutting concerns such as authentication or logging.
17. Explain the concept of React hooks.
React hooks are functions that enable functional components to use state and other React features without writing a class. Some commonly used hooks include useState, useEffect, useContext, and useRef.
18. What are controlled and uncontrolled components in React?
Controlled components are components whose state is controlled by React. Their value is controlled by React state, and any user input is handled by React event handlers. Uncontrolled components, on the other hand, manage their own state internally using refs.
19. How do you optimize performance in React applications?
Performance optimization techniques in React include using memoization, minimizing re-renders with PureComponent or React.memo, lazy loading components with React.lazy and Suspense, code splitting, and optimizing bundle size.
20. What are React fragments?
React fragments allow developers to return multiple elements from a component without adding extra nodes to the DOM. They are particularly useful when a component needs to return multiple children elements without a parent wrapper.
21. Explain the concept of context in React.
Context provides a way to pass data through the component tree without having to pass props down manually at every level. It's commonly used for global data such as themes, user authentication, or localization.
22. What are the differences between useEffect and useLayoutEffect?
useEffect runs after the render is committed to the screen, while useLayoutEffect runs synchronously after all DOM mutations. Use useEffect for data fetching, subscriptions, or manually changing the DOM, and useLayoutEffect for DOM measurements and adjustments.
23. How do you handle forms in React?
Forms in React can be controlled or uncontrolled. Controlled forms manage the form state using React state and update it with onChange handlers, while uncontrolled forms rely on refs to access form values.
24.What is server-side rendering (SSR) in React?
Server-side rendering is the process of rendering React components on the server and sending the generated HTML to the client. SSR improves initial page load performance and SEO by serving fully rendered HTML to web crawlers.
25. Explain the concept of error boundaries in React.
Error boundaries are React components that catch JavaScript errors anywhere in their child component tree, log those errors, and display a fallback UI instead of crashing the entire component tree. They help isolate errors and prevent them from propagating to higher-level components.
26. How do you handle routing in a React application?
React Router is the most commonly used library for handling routing in React applications. It allows developers to define routes using JSX syntax and render different components based on the current URL.
27. What are the differences between React class components and functional components?
Class components use ES6 classes and have access to lifecycle methods and local state, while functional components are plain JavaScript functions and use hooks for state management and side effects.
28. How do you handle side effects in React functional components?
Side effects in functional components are handled using hooks like useEffect, which allows developers to perform data fetching, subscriptions, or DOM mutations after the component renders.
29. Explain the purpose of the key prop in React lists.
The key prop is a special attribute that helps React identify which items have changed, been added, or been removed from a list. It's important for performance and ensures that React can efficiently update the DOM when the list changes.
30. What are the differences between React state and Redux?
React state is local to a component and is typically used for managing component-specific data, while Redux is a state management library that provides a centralized global state for an entire application. Redux is commonly used for larger applications with complex state management needs.
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