How to manage state in Flutter apps?

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Managing state in Flutter apps is a core part of building reactive, maintainable applications. State management refers to how you handle and update the data that your UI depends on, ensuring the UI reflects the current state of the app.

Here’s an overview of common approaches to manage state in Flutter, from simple to advanced:

1. setState (Local State)

Use when: State is simple and only affects a single widget or a small part of the widget tree.

How it works: Call setState() inside a StatefulWidget to update the UI when state changes.

Example:

dart

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Edit

class CounterWidget extends StatefulWidget {

  @override

  _CounterWidgetState createState() => _CounterWidgetState();

}

class _CounterWidgetState extends State<CounterWidget> {

  int _counter = 0;

  void _increment() {

    setState(() {

      _counter++;

    });

  }

  @override

  Widget build(BuildContext context) {

    return Column(

      children: [

        Text('Count: $_counter'),

        ElevatedButton(onPressed: _increment, child: Text('Increment')),

      ],

    );

  }

}

2. InheritedWidget & InheritedModel

Use when: You want to propagate state down the widget tree efficiently without passing props manually.

How it works: Widgets down the tree can subscribe to the inherited widget to rebuild when the data changes.

Common use: Used under the hood by some state management libraries.

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