What is the Singleton Pattern in JavaScript?

What is the Singleton Pattern in JavaScript?

The Singleton Pattern ensures a class has only one instance and provides a global point of access to it.

Can you give me an example of how to implement it?

Sure! Here's a simple implementation:

const Singleton = (function () {
    let instance;

    function createInstance() {
        const object = new Object("I am the instance");
        return object;
    }

    return {
        getInstance: function () {
            if (!instance) {
                instance = createInstance();
            }
            return instance;
        }
    };
})();

const instance1 = Singleton.getInstance();
const instance2 = Singleton.getInstance();

console.log(instance1 === instance2); // true

What are the benefits of using the Singleton Pattern?

The benefits include controlled access to a single instance, reduced memory usage, and easier debugging.

Are there any drawbacks to using it?

Yes, drawbacks include potential global state issues and difficulties in testing due to tight coupling.