mixin.dart

class Musician {}

//creating a mixin
mixin Feedback {
  void boo() {
    print('boooing');
  }

  void clap() {
    print('clapping');
  }
}

//only classes that extend or implement the Musician class
//can use the mixin Song
mixin Song on Musician {
  void play() {
    print('-------playing------');
  }

  void stop() {
    print('....stopping.....');
  }
}

//To use a mixin, use the with keyword followed by one or more mixin names
class PerformSong extends Musician with Feedback, Song {
  //Because PerformSong extends Musician,
  //PerformSong can mix in Song
  void awesomeSong() {
    play();
    clap();
  }

  void badSong() {
    play();
    boo();
  }
}

void main() {
  PerformSong().awesomeSong();
  PerformSong().stop();
  PerformSong().badSong();
}