This video explores the solution to the challenge. It's a bit more challenging because you need to make two calls instead of one for the interfaces to match.
(electronic music) … - [Narrator] Here's our solution … for the drone adapter. … Remember that the adapter needs … to implement the interface of the object it's adapting to. … Which in this case, is the duck. … So the adapter must implement … the two duck interface methods quack and fly. … The drone adapter takes a drone. … The quack method of the drone adapter … delegates to the beep method of the drone. … So the drone makes a sound. … The fly method of the drone adapter … is a little more complex. … To fly the drone, we actually need … to call two methods: … spin rotors and take off. … So one method in the duck interface … corresponds to two method calls … in the drone's interface. … Now that we have the drone adapter … that implements the duck interface, … we can add the drone to the duck simulator. … Here's how we do that. … We first create a drone and then create a drone adapter, … passing the drone to the adapter. … What we get back is a drone adapter, … but remember, it's also a duck, …
- What are design patterns?
- Encapsulating code that varies with the Strategy pattern
- The limitations of inheritance
- Using the Adapter pattern
- Implementing the Observer pattern
- Extending behavior with composition and the Decorator pattern
- Encapsulating iteration with the Iterator pattern
- Object creation with the Factory Method pattern
- Using design principles to guide your object-oriented design
Skill Level Intermediate
1. Design Patterns
2. The Strategy Pattern
3. The Adapter Pattern
4. The Observer Pattern
Using the Observer pattern2m 23s
5. The Decorator Pattern
6. The Iterator Pattern
7. The Factory Patterns
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