Design patterns in general, allow for developers to use pre-defined and proven templates to structure a logical solution to a type of problem.

There are a lot of design patterns available and huge books for you to read up on them. Some of these patterns can be quite confusing, while others, very intuitive, so much so that sometimes you’ll find out you’ve been implementing a pattern without even know about it.

And in particular, the Singleton pattern is probably one of the most common patterns out there, it’s not specifically complex and it’s a great way to get started with them.

What is the Singleton pattern?

The singleton pattern is a way to structure your code so that you can’t have more than one instance of your logic, ever.

In case it wasn’t obvious yet, these patterns are meant for the Object-Oriented Programming paradigm. This means that the above sentence can be translated to:

By implementing a singleton we can ensure we only have one instance of our class, ever.

As you’re about to see, Typescript has all the required tools for us to actually ensure that the above statement is 100% true.

Implementing Singleton on TypeScript

The implementation is simple, but we do have to ensure there is no way for a user to instantiate twice our class. And how can we do that? By default the new keyword creates a new instance, and we can’t override that behavior.

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