Patterns: Singleton Pattern!

The Singleton Pattern is a design pattern that restricts the instantiation of a class to a single instance and provides a global point of access to that instance. In Javascript, you can implement the Singleton Pattern using different approaches, such as:

1. Using a simple object literal:

const Singleton = {
  instance: null,
  getInstance() {
    if (!this.instance) {
      this.instance = {
        // your singleton object properties and methods here
      };
    }
    return this.instance;
  }
};

This approach uses an object literal to create a single instance of your class, which is stored in the instance property. The getInstance() method checks if an instance already exists and creates one if it doesn’t. This method also returns the instance, ensuring that there is only one instance of the object at any given time.

2. Using a class:

class Singleton {
  static instance = null;
  constructor() {
    if (!Singleton.instance) {
      Singleton.instance = this;
      // your singleton object properties and methods here
    }
    return Singleton.instance;
  }
}

This approach uses a class to create a single instance of your class. The constructor checks if an instance already exists and creates one if it doesn’t. This method also returns the instance, ensuring that there is only one instance of the object at any given time.

These are just two examples of how you can implement the Singleton Pattern in JavaScript. Keep in mind that the Singleton Pattern can also have drawbacks, such as making your code less flexible and harder to test, so use it judiciously.