Observer

Observer - Dart

The Observer pattern defines a one-to-many dependency between objects. A subject (observable) maintains a list of its dependents (observers) and notifies them of any state changes. This promotes loose coupling, allowing the subject to change without affecting observers, and vice-versa.

The Dart implementation uses …

Observer - Scala

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, we implement it using Scala’s functional approach with Observable holding a collection of Observer function types. When the Observable …

Observer - PHP

The Observer pattern defines a one-to-many dependency between objects. When the state of an object (the subject) changes, all its dependent objects (the observers) are notified and updated automatically. This promotes loose coupling, allowing subjects and observers to change independently.

The code implements this with …

Observer - Ruby

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. A subject (observable) maintains a list of observers and notifies them of any state changes. This promotes loose coupling as subjects don’t need …

Observer - Swift

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, allowing subjects and observers to interact without knowing each other’s …

Observer - Kotlin

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. This promotes loose coupling and improved modularity. Here, Subject maintains a list of Observers and notifies them when its data changes. The …

Observer - Rust

The Observer pattern defines a one-to-many dependency between objects. A subject maintains a list of its dependents, called observers, and automatically notifies them of any state changes. This promotes loose coupling; the subject doesn’t need to know concrete observer classes, only that they implement a common …

Observer - Go

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. It promotes loose coupling as the subject doesn’t need to know concrete observer details.

This Go implementation uses interfaces to define the …

Observer - C

The Observer pattern defines a one-to-many dependency between objects. When one object (the subject) changes state, all its dependents (observers) are notified and updated automatically. This promotes loose coupling as subjects are unaware of specific observers. The code uses function pointers to represent observers, …

Observer - C++

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. Here, we use C++’s standard std::function for the observer’s update method, …