The decorator pattern is for those situations where you can accommodate change at runtime through composition. In this video, explore how to apply the decorator to a specific example.
- [Narrator] Now that you're familiar … with the decorator pattern, … let's take a look at the definition … from the Gang of Four catalog. … The decorator pattern attaches … additional responsibilities to an object dynamically. … Decorators provide a flexible alternative to subclassing … for extending functionality, … and we have a sense of how this design pattern … can help us make a flexible design from our coffee example. … As you're seeing, the formal definition of a pattern … usually describes the role of the pattern, … but it doesn't necessarily help us … know how to implement it in our own designs. … As with all design pattern definitions, … we really need to look at a class diagram … to get a better sense for how the pattern works. … There are two important parts to the decorator pattern. … There are the components … which are the beverages in our example … and the decorators which are the condiments in our example. … Starting at the top of this diagram, … you can see that we have a component class. …
- 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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