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What is Hot Reload In Flutter?

In Flutter, hot reload is a powerful feature that allows developers to quickly see the changes they make to their code reflected in the running app without the need to restart or rebuild the entire application. It significantly speeds up the development process and enables developers to iterate and experiment with their code more efficiently.

When you save changes to your Flutter code, such as modifying widget properties, adding or removing widgets, or updating logic, you can trigger a hot reload. The Flutter framework then injects the updated code into the running Dart Virtual Machine (VM), replacing the old code with the new changes.

Hot reload works by maintaining the application's state while updating the user interface. It tries to preserve the existing state as much as possible, so you can continue interacting with the app without losing your current context. Any changes made to the UI will be immediately visible on the screen.

The hot reload feature in Flutter offers several advantages:

1. Speed: Hot reload allows for quick feedback loops by instantly reflecting changes in the app's UI, reducing development time.

2. Iteration: Developers can experiment, tweak, and refine their code, making it easier to fine-tune the user experience and fix bugs.

3. State preservation: Hot reload attempts to preserve the application state, allowing you to see UI changes without losing the current context or having to navigate through the app again.

4. Real-time debugging: You can inspect the UI and the underlying code while the app is running, making it easier to diagnose and fix issues.

Hot reload is not limited to just UI changes; it can also update business logic and data processing. However, there might be cases where a hot restart is necessary, such as when you modify dependencies or make changes that require a full rebuild of the app.

To trigger hot reload in Flutter, you can use the hot reload button in the development environment, use a keyboard shortcut (e.g., "r" in the Flutter console), or use the command-line interface (CLI) with the "flutter reload" command.

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