Mastering JavaScript Design Patterns

Singleton

The Singleton pattern is perhaps the most overused pattern. It is also a pattern that has fallen out of favor in recent years. To see why people are starting to advise against using Singleton, let's take a look at how the pattern works.

Singleton is used when a global variable is desirable, but Singleton provides protection against accidentally creating multiple copies of a complex object. It also allows for the deferral of object instantiation until the first use.

The UML diagram for Singleton is as follows:

It is clearly a very simple pattern. The Singleton pattern acts as a wrapper around an instance of the class and the Singleton itself ...