What are mixins used for in programming?

Mixins in programming are used for:

• Reusing functionality: They allow adding sets of methods and properties to classes without using inheritance.
• Multiple mixins: A class can "mix in" functionality from several mixins, solving the problem of multiple inheritance.
• Separation of concerns: They help divide logic into thematic blocks and apply them where necessary.

In Flutter, mixins are often used with the with keyword to add specific behavior to widgets or classes, for example, to implement TickerProviderStateMixin.

// Example of a mixin in Dart (Flutter)
mixin Logger {
  void log(String message) {
    print('[LOG] $message');
  }
}

class MyClass with Logger {
  void performAction() {
    log('Performing action...');
    // ... other logic
  }
}