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Learn React 19: The Complete Guide to Modern Web Apps

Solution: Build a Theme and Notifications Panel

The implementation of a theme and notifications panel utilizes a scoped theme context and reusable toggle components, showcasing modular state management and local notification handling. Key components include the ThemeContext for managing theme state with a reducer, and the Toggle component for handling toggle states. The ThemeSettingsSection allows users to switch between light and dark modes, while the NotificationsSettingsSection manages notification preferences with dynamic updates. This structure promotes efficient state management and UI responsiveness through context and hooks.

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Below is an example implementation of a theme and notifications panel that uses a scoped theme context and reusable toggle components. The implementation demonstrates modular state management, local notification handling, and UI updates driven by state changes.

Solution

Here’s the implementation for the “Theme” and “Notifications” panel, featuring segmented context, reusable toggles, and dynamic state management:

Explanation

Here’s an explanation of the code above:

  • In the ThemeContext.js file:

    • Lines 1–4: Create two contexts: one for state, one for dispatch.

    • Lines 6–8: Define ...