React Performance Optimization Tips

React (or ReactJS) is a free, open-source JavaScript library developed by Meta for building user interfaces, specifically for single-page and mobile applications.

It allows developers to create large web applications that can change data without reloading the page, focusing on speed, simplicity, and scalability.

• Component-Based Architecture: UIs are built from small, independent, and reusable pieces called components. Each component manages its own state and logic, which simplifies the development of complex interfaces.
• Virtual DOM: React uses a lightweight copy of the browser's DOM. When data changes, React identifies the exact difference ("diffing") and updates only the necessary parts of the real DOM, significantly boosting performance.
• Declarative UI: Developers describe what the UI should look like for a given state, and React handles the rendering. This makes code more predictable and easier to debug.
• Unidirectional Data Flow: Data moves in one direction—from parent to child via props—ensuring predictable state management.
• JSX (JavaScript XML): An extension that allows writing HTML-like code directly within JavaScript, making the structure of components more readable.

const MemoComponent = React.memo(({ value }) => {
  return <div>{value}</div>;
});

💡 Tip: Use useMemo and useCallback wisely.