React
A declarative, efficient, and flexible JavaScript library for building user interfaces. React makes it painless to create interactive UIs with its component-based architecture.
React has revolutionized the way we build web applications. Created by Facebook and maintained by a vibrant open-source community, React has become the go-to library for building modern, interactive user interfaces. Its component-based architecture and virtual DOM make it both powerful and efficient.
Core Concepts
Components
Reusable building blocks that encapsulate UI logic and rendering.
- • Functional components
- • Class components
- • Component composition
- • Props and state
JSX
A syntax extension that allows writing HTML-like code in JavaScript.
- • Declarative UI
- • JavaScript expressions
- • Conditional rendering
- • Lists and keys
Virtual DOM
A lightweight representation of the actual DOM for efficient updates.
- • Reconciliation algorithm
- • Diffing process
- • Batch updates
- • Performance optimization
State Management
Managing component data and application state.
- • useState hook
- • useReducer
- • Context API
- • State lifting
Modern React Patterns
Hooks
Hooks are functions that let you "hook into" React state and lifecycle features from function components. They enable you to use state and other React features without writing a class.
Essential Hooks
- useState: Manage local component state
- useEffect: Handle side effects
- useContext: Access context values
- useMemo: Memoize expensive calculations
- useCallback: Memoize functions
- useRef: Access DOM elements
- useReducer: Complex state logic
- Custom hooks: Reusable logic
React Router
Declarative routing for React applications. It enables navigation between different components in a React application, allowing the creation of single-page applications with multiple views.
Performance Optimization
React provides several tools and techniques for optimizing application performance:
- React.memo: Prevent unnecessary re-renders of functional components
- useMemo and useCallback: Optimize expensive operations
- Code splitting: Load components on demand with React.lazy
- React DevTools: Profile and debug performance issues
"React is not just a library—it's a way of thinking about building user interfaces."
React Ecosystem
Next.js
Full-stack React framework with SSR and SSG
Redux
Predictable state container for JavaScript apps
React Native
Build native mobile apps using React
Getting Started with React
Whether you're building a simple component or a complex application, React provides the tools and patterns you need to create maintainable, scalable user interfaces. Its component-based architecture encourages reusability and makes testing straightforward.
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