Singleton Design Pattern

The Singleton pattern is a creational design pattern that ensures a class has only one instance and provides a global access point to it.

In software development, there are situations where we need to restrict the instantiation of a class to a single object. This is particularly useful when dealing with shared resources or managing global state.

The Singleton pattern is implemented by defining a class with a private constructor and a static method. The first time the static method is called, it creates a new instance of the class. In subsequent calls, it returns the existing instance.

The Singleton pattern provides the following benefits:

  • Ensures that there is only one instance of a class in the application.
  • Provides a global access point to that instance.
  • Delays the initialization of the instance, improving performance and resource utilization.

The following are two implementations of the Singleton pattern in Go, each demonstrating how to connect to a database:

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