The observer pattern is another design pattern that is easily explained with a real-world analogy. In this video, learn how to use a newspaper subscription to set the scene.
- The observer pattern exemplifies … the design principle of loose coupling. … This principle tells us to strive … for loosely coupled designs between objects that interact. … What are loosely coupled objects? … We say that objects are loosely coupled … when they interact with one another, … which makes them coupled, but they don't know a lot … about each other, which makes them loosely coupled. … With loose coupling, objects don't become too dependent … on each other. … As we'll see, this helps to keep our design more flexible. … For instance, with the observer pattern, loose coupling … helps us to minimize the complexity of a scenario … where there are a lot of objects coming and going … during a computation, and those objects need … to be kept up to date on an important piece of data … or a set of events. … The observer pattern is one of … the most commonly used patterns. … You'll use it in your own code, and you'll see it used … in many libraries and frameworks. … And, like the adapter pattern, the observer pattern …
- 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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