React is a powerful JavaScript library for building user interfaces, particularly for single-page applications (SPAs). It enables efficient rendering and state management through its component-based architecture. Here's a detailed breakdown:
1. Core Concepts
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Components – Reusable UI elements that manage their own state.
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Props – Data passed between components to maintain modularity.
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State – Internal component data that triggers re-renders.
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Virtual DOM – Optimizes rendering by updating only necessary parts of the UI.
2. JSX (JavaScript XML)
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Syntax – Combines JavaScript and HTML-like markup.
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Dynamic Rendering – Embeds expressions within JSX.
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Conditional Rendering – Uses ternary operators and logical conditions.
3. React Lifecycle Methods
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Mounting – componentDidMount(), useEffect().
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Updating – componentDidUpdate(), state changes.
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Unmounting – componentWillUnmount().
4. Hooks & Functional Components
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useState – Manages component state.
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useEffect – Handles side effects like API calls.
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useContext – Shares state across components.
5. React Router
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Routing – Enables navigation between pages.
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Dynamic Routes – Handles URL parameters.
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Nested Routes – Organizes complex applications.
6. State Management
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Context API – Built-in state management.
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Redux – Centralized state management for large applications.
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Recoil & Zustand – Alternative lightweight state management solutions.
7. Performance Optimization
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Memoization – React.memo() and useMemo() for caching.
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Lazy Loading – React.lazy() for code splitting.
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Concurrent Mode – Improves responsiveness.
8. Advanced Features
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Server-Side Rendering (SSR) – Next.js for improved SEO.
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Static Site Generation (SSG) – Pre-rendering pages for performance.
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Progressive Web Apps (PWA) – Enhancing offline capabilities.