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React's evolution from 2011 to present demonstrates remarkable consistency in API design philosophy. Starting with Jordan Walke's experiments at Facebook, React introduced JSX for flexible templating, virtual DOM for performance optimization, and component-based architecture. The transition from class components to hooks enabled better logic composition and side effect management. The Fiber rewrite in React 16 unlocked concurrent features, error boundaries, code splitting, and Suspense for loading states. React 19's 'use' API for data fetching represents the culmination of years of architectural decisions, enabling efficient parallel data loading while maintaining the framework's core principles of declarative UI and unidirectional data flow.

The History of React Through Code

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