All software engineers should be familiar with design patterns. One of the most known and common one is the singleton pattern. If you want to understand this pattern and how to use it with Node.JS read this quick and easy tutorial.

A bit of theory

We need singleton when we want to make sure there is only one object instantiated. Therefore, instead of creating a new object we need to ensure the constructor was called only once and then we reuse the instance.

We can achieve this by refactoring our class to have:

• hidden (private)constructor
• public getInstance method that returns instance of the class

That’s the theory part done. Let’s get started with some coding!

#design-patterns #nodejs #javascript #tutorial #software-engineering