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React: Integration and State Management (Step 4)

1. The Need for State Management​

As an application grows, the need to share data across multiple components arises. This often leads to a problem called Prop Drilling, which can be solved using various state management techniques.

2. Context API​

A built-in React feature that allows you to pass data through the component tree without having to pass props down manually at every level.

// 1. Create Context
const ThemeContext = createContext('light');

// 2. Wrap with Provider
function App() {
  return (
    <ThemeContext.Provider value="dark">
      <Toolbar />
    </ThemeContext.Provider>
  );
}

// 3. Use in Consumer (useContext hook)
function Button() {
  const theme = useContext(ThemeContext);
  return <button className={theme}>Theme Button</button>;
}

3. External State Management Libraries (Redux, Zustand)​

External libraries are used when dealing with complex state logic or large-scale data flow.

  • Zustand: A lightweight and intuitive library that has gained significant popularity recently.
  • Redux Toolkit: The traditional, powerful, and standard tool with a very large community.

4. Practical Tip: When to use what?​

  1. Simple sharing: useState + Props
  2. Themes, User info: Context API
  3. Complex business logic: Zustand or Redux
  4. Server data state: React Query
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