As its name implies, the Singleton pattern's primary goal is to guarantee singularity. This approach means if a class implements this pattern correctly, once initialized, it will have only one instance of itself in memory during runtime. This mechanism can be helpful when you have a class that manages a system that needs to be globally accessible from a singular and consistent entry point.
The design of the Singleton is quite simple. When you implement a Singleton class, it becomes responsible for making sure there's only a single occurrence of itself in memory. Once a Singleton detects an instance of an object of the same type as itself, it will destroy it immediately. Therefore, it's pretty ruthless and doesn't tolerate any competition. The following diagram illustrates the process to a certain degree:
The most important takeaway from this description of the Singleton...
