What are the differences between design patterns in Go?

Can you explain the differences between the Singleton and Factory design patterns in Go?

Sure! The Singleton pattern ensures a class has only one instance and provides a global point of access to it. In Go, this can be implemented using a package-level variable and a sync.Once to ensure thread safety. The Factory pattern, on the other hand, is used to create objects without specifying the exact class of object that will be created. It provides an interface for creating objects in a superclass but allows subclasses to alter the type of objects that will be created.

How do I implement the Observer pattern in Go?

To implement the Observer pattern in Go, you can define an interface for the Observer and another for the Subject. The Subject maintains a list of observers and notifies them of any state changes. Observers implement the update method to receive notifications.

What are some common use cases for the Strategy pattern?

The Strategy pattern is useful when you want to define a family of algorithms, encapsulate each one, and make them interchangeable. Common use cases include sorting algorithms, payment methods in e-commerce, and different compression strategies.

Can you give me an example of the Decorator pattern in Go?

Certainly! In Go, the Decorator pattern can be implemented by creating a base interface and concrete implementations. You can then create decorator structs that wrap the original objects, adding new behavior while keeping the interface intact.