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Observer

Observer in Swift

Observer is a behavioral design pattern that allows some objects to notify other objects about changes in their state.

The Observer pattern provides a way to subscribe and unsubscribe to and from these events for any object that implements a subscriber interface.

Complexity:

Popularity:

Usage examples: The Observer pattern is pretty common in Swift code, especially in the GUI components. It provides a way to react to events happening in other objects without coupling to their classes.

Identification: The pattern can be recognized by subscription methods, that store objects in a list and by calls to the update method issued to objects in that list.

Observer in Other Languages

Observer in C# Observer in C++ Observer in Go Observer in Java Observer in PHP Observer in Python Observer in Ruby Observer in Rust Observer in TypeScript