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Update 07-facade-observer.md #42

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4 changes: 2 additions & 2 deletions notes/07-facade-observer.md
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Expand Up @@ -158,7 +158,7 @@ The two approaches we have discussed so far are not ideal. The first approach vi
1. `Observable interface` - This interface defines the methods that the subject class must implement. The subject class is responsible for notifying the observers when the state of the subject changes.

```java
public interface class Observable {
public interface Observable {
void addObserver(Observer observer);
void removeObserver(Observer observer);
void notifyObservers();
Expand Down Expand Up @@ -255,4 +255,4 @@ public class Client {
* [Observer Pattern - III](https://www.oreilly.com/library/view/learning-javascript-design/9781449334840/ch09s05.html)
* [Observer Pattern - IV](https://www.dottedsquirrel.com/observer-pattern-javascript/)
* [Observer Pattern - V](https://blog.bitsrc.io/the-observer-pattern-in-javascript-the-key-to-a-reactive-behavior-f28236e50e10)
* [Observer Pattern - VI](https://www.digitalocean.com/community/conceptual_articles/observer-design-pattern-in-javascript)
* [Observer Pattern - VI](https://www.digitalocean.com/community/conceptual_articles/observer-design-pattern-in-javascript)