Dart Island · Level 9
Mixins
Mixins let you reuse behaviour across classes without inheritance. Instead of extending one parent, you mix in multiple capabilities using the
10 games: drag abilities onto animals, resolve conflicts, design your own mixins.
with keyword.10 games: drag abilities onto animals, resolve conflicts, design your own mixins.
What is a mixin?
A mixin is a bundle of methods you can mix into any class using with. The class gains those methods without inheriting from a parent.
mixin Flyable {
void fly() => print('I can fly!');
}
mixin Swimmable {
void swim() => print('I can swim!');
}
class Duck with Flyable, Swimmable {
// Duck can now fly() AND swim()
}
- mixin — defines a reusable capability (not a full class)
- with — mix in one or more mixins to a class
- on — constrain a mixin to only work on specific classes
- Order — rightmost mixin wins on method conflicts
Progress
0 / 10 mini-games solved
Stage 1
Mixin Mix
Drag capability badges onto animal cards.
1. Click a capability badge below.
2. Click the animal that should have that ability.