Diagrammatical Explanation of the above Example

Diagrammatical Representation of the given Example

Lets understand the example:

Subject – NewsAgency: The “NewsAgency” class represents the subject. It has the responsibility of maintaining a list of observers and notifying them of any changes. It has methods such as “registerObserver”, “removeObserver”, “setNews”, and “notifyObservers”. When “setNews” is called, it sets the news and then notifies all the registered observers by calling their “update” method.
Observer – NewsReader: The “NewsReader” class represents the observer. It has a “name” property and an “update” method. The “update” method is called by the “NewsAgency” when it notifies the observers, and it simply logs a message to the console with the news that was received.
Usage: In the usage section, a “NewsAgency” instance is created as “agency”, and two “NewsReader” instances are created as “reader1” and “reader2”. The two readers are then registered as observers with the “agency”. After that, the “agency” sets the news by calling the “setNews” method with the news as an argument. This triggers the “update” method of both “reader1” and “reader2” with the provided news, and they log the news to the console.

Behavioral Design Pattern | JavaScript Design Pattern

Behavioral design patterns are a subset of design patterns in software engineering that deal with the interaction and responsibilities of objects. These patterns focus on how objects communicate and work together to achieve common tasks.

Important Topics for the Behavioral Design Pattern in JavaScript Design Patterns

Uses Cases of the Behavioral Design Pattern
Example of the Behavioral Design Pattern in JavaScript Design Pattern:
Key Component of Behavioral Design Pattern:
Step-by-step Code Explanation for the above Example
Diagrammatical Explanation of the above Example
Advantages of the Behavioral Design Pattern
Disadvantages of the Behavioral Design Pattern
Conclusion:

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Observer Pattern: This pattern is useful when you need to maintain a one-to-many dependency between objects. For example, it is used in event handling systems, where one object notifies several other objects about any state changes. Strategy Pattern: This pattern is used when you want to define a family of algorithms, encapsulate each one of them, and make them interchangeable. This allows the algorithm to vary independently from the clients that use it, making it useful when you have different variations of an algorithm that you want to use interchangeably. Chain of Responsibility Pattern: This pattern is employed when you want to pass a request along a chain of handlers. It allows more than one object to handle the request, and the handler is determined dynamically at runtime. This is often used in GUI systems for handling events. Command Pattern: This pattern is useful when you want to encapsulate a request as an object, thereby allowing you to parameterize clients with queues, requests, and operations. It’s commonly used in the implementation of menu systems, where menu items are bound to specific actions. State Pattern: This pattern is helpful when an object changes its behavior based on its internal state. It allows an object to alter its behavior when its internal state changes. This pattern is commonly used in vending machines where a machine changes its behavior based on the current state (e.g., if it’s out of stock). Iterator Pattern: This pattern is used to provide a way to access elements of an aggregate object sequentially without exposing its underlying representation. It is commonly used in collection classes, providing a way to access elements of a collection without needing to know its internal structure. Interpreter Pattern: This pattern is useful when you need to define a representation for a grammar along with an interpreter to interpret the grammar. It’s commonly used in the development of programming languages and symbol-processing engines....

Diagrammatical Explanation of the above Example

Behavioral Design Pattern | JavaScript Design Pattern

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