Flutter NYC Meetup July 2018 - What's new in Dart 2.0

playground.dart

void main(){
  Animal bob = new Kitten();
  bob.grow();
  bob.birthday();
}

class Animal {
  int age;
  Animal(){
    age = 0;
    print("Animal in the house!");
  }
  grow(){
    age++;
  }
  birthday(){
    print("My age is: ${age}");
  }
}

class Kitten extends Animal {
  //
}

class Puppy extends Animal {
  // 
}

class Puppy extends Animal {
  // 
  speak() {
    print('Bow to the wow... ' + String.fromCharCode(0x1f436) + ' Bow wow!');
  }
}