Alternatives to Singleton

Programmers generally don’t recommend using the singleton pattern because we can only create one object due to its design. Let’s discuss its advantages and disadvantages in detail.

Advantages

• Singleton prevents other objects from instantiating the copies of the singleton object, ensuring that all objects access the single instance.

• The class controls the instantiation process. So, it has the flexibility to change the instantiation process.

• We don’t need to include multiple variables in this method, so its implementation is quick and easy.

Disadvantages

• In programming, global variables are generally considered bad because any code in the application can make changes to it. The singleton pattern violates this principle.

• The one object creation principle makes it difficult for the system to scale. We need to be 100 percent sure (which is generally not possible) that we only need one instance during the whole lifetime of the class.

• The singleton pattern makes unit testing very difficult. In unit testing, we generally want to mock the object, and the singleton pattern doesn’t allow that.

• The ...