What is the role and purpose of mixins in programming?

Mixins in Flutter are a way to reuse code and add functionality to classes without inheritance. They allow you to "intervene" in a class and extend its behavior.

Role of mixins:

• Allow sharing common logic between different classes.
• Avoid issues with multiple inheritance, which is not available in Dart.
• Simplify code organization and increase reusability.

Example of a mixin in Dart/Flutter:

mixin Logger {
  void log(String message) {
    print('Log: $message');
  }
}

class MyWidget extends StatelessWidget with Logger {
  @override
  Widget build(BuildContext context) {
    log('Building MyWidget');
    return Container();
  }
}

Here, the Logger mixin adds a log method to the MyWidget class. This allows using the functionality without inheriting from a separate class.