Observer

Observer - C#

The Observer pattern defines a one-to-many dependency between objects so that when one object changes state, all its dependents are notified and updated automatically. Here, an ISubject interface declares the Attach, Detach, and Notify methods for managing observers. A concrete Subject publishes events containing …

Observer - TypeScript

The Observer pattern defines a one-to-many dependency between objects. A subject (observable) maintains a list of observers (dependents), and notifies them of any state changes. This promotes loose coupling, allowing subjects and observers to change independently.

This TypeScript implementation uses classes and …

Observer - JavaScript

The Observer pattern defines a one-to-many dependency between objects. A subject (observable) maintains a list of its dependent observers and automatically notifies them of any state changes. This promotes loose coupling, as observers don’t need to know the subject’s specifics, only how to react to changes. …

Observer - Python

The Observer pattern defines a one-to-many dependency between objects so that when one object (the subject) changes state, all its dependents (observers) are notified and updated automatically. This promotes loose coupling, allowing subjects and observers to evolve independently.

The code implements the pattern with a …

Observer - Java

The Observer pattern defines a one-to-many dependency between objects. When the state of one object (the Subject) changes, all its dependent objects (the Observers) are notified and updated automatically. This promotes loose coupling, as the Subject doesn’t need to know specific Observer details.

The code …