React
JavaScript LibraryReact is a popular JavaScript library developed by Facebook for building user interfaces, particularly web applications. It allows developers to create reusable UI components and efficiently manage the application state, making it easier to build complex, interactive user interfaces.
Core React Concepts
- Components: Reusable pieces of UI that can be composed together
- JSX: JavaScript syntax extension that looks similar to HTML
- Props: Properties passed from parent to child components
- State: Data that changes over time within a component
- Virtual DOM: In-memory representation of the real DOM for efficient updates
React Component Example
import React, { useState } from 'react'; function Counter() {
const [count, setCount] = useState(0); return ( <div>
<h2>Count: {count}</h2> <button onClick={() =>
setCount(count + 1)}> Increment </button> <button
onClick={() => setCount(count - 1)}> Decrement
</button> </div> ); } export default Counter;
React Hooks
- useState: Manage component state
- useEffect: Handle side effects and lifecycle events
- useContext: Access React context values
- useReducer: Manage complex state logic
- useMemo: Optimize expensive calculations
- useCallback: Optimize function references
React Ecosystem
- React Router: Client-side routing
- Redux/Zustand: State management
- Next.js: Full-stack React framework
- Material-UI/Chakra UI: Component libraries
- React Testing Library: Testing utilities
- Storybook: Component development environment