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§ What is a singleton and why we need it

In this video, we will be examining the Singleton design pattern in JavaScript and how it can be used to ensure that there is only one instance of a class throughout your application.

Singleton pattern is a design pattern in which a class has only one instance and provides a global point of access to it. The idea is to create only one instance of a class and use that instance whenever required in the application.

In JavaScript, the Singleton pattern can be implemented by creating an object and returning its reference. Here's an example:

let instance = null;

class Singleton {
  constructor() {
    if (!instance) {
      instance = this;
    return instance;

const a = new Singleton();
const b = new Singleton();

console.log(a === b); // true


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