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Flutter Interview Questions and Answers

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Ques 1. What is Flutter?

Flutter is an open-source UI software development toolkit created by Google. It is used to develop natively compiled applications for mobile, web, and desktop from a single codebase.

Example:

import 'package:flutter/material.dart';
void main() => runApp(MyApp());

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Ques 2. Explain the widget tree in Flutter.

The widget tree is a hierarchical structure of widgets in a Flutter application. Widgets are UI components, and the tree represents the user interface. Each widget has a parent and can have children. Flutter apps are built by combining multiple widgets.

Example:

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text('My App'),
        ),
        body: Text('Hello, Flutter!'),
      ),
    );
  }
}

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Ques 3. What is the 'setState' method in Flutter used for?

'setState' is a method in the 'State' class of Flutter. It is used to rebuild the widget tree and schedule a rebuild of the user interface when the internal state of the widget changes.

Example:

void _incrementCounter() {
  setState(() {
    _counter++;
  });
}

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Ques 4. Explain the difference between 'StatefulWidget' and 'StatelessWidget' in Flutter.

'StatefulWidget' is a widget that can change its state during runtime, while 'StatelessWidget' is a widget that remains immutable once it is built. 'StatefulWidget' is used for dynamic UI components.

Example:

class MyStatefulWidget extends StatefulWidget {
  @override
  _MyStatefulWidgetState createState() => _MyStatefulWidgetState();
}
class _MyStatefulWidgetState extends State {
  // Stateful logic here
}

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Ques 5. What is the purpose of the 'async' and 'await' keywords in Dart/Flutter?

'async' and 'await' are used for handling asynchronous operations in Dart/Flutter. 'async' is used to mark a function as asynchronous, and 'await' is used to wait for the result of an asynchronous operation.

Example:

Future fetchData() async {
  var data = await fetchDataFromServer();
  print('Data: $data');
}

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