One Instance to Rule Them All - Singletons

Now that we've learned what a design pattern is, as well as why we'd want to use them, let's first talk about a design pattern that most people learn, the Singleton pattern.

The Singleton pattern is probably the most well-known pattern and it is also the one out there that is most often misused. It definitely has the most controversy surrounding it, so when discussing this pattern it is as important (or even more important) to know when not to apply it.