What are some examples of design patterns in JavaScript?

What are some examples of design patterns in JavaScript?

There are several design patterns in JavaScript, including Singleton, Factory, and Observer patterns. Would you like to know more about a specific one?

Can you explain the Singleton pattern?

Sure! The Singleton pattern ensures that a class has only one instance and provides a global point of access to it. It's useful for managing shared resources.

What about the Factory pattern?

The Factory pattern allows you to create objects without specifying the exact class of object that will be created. It provides a way to encapsulate the instantiation logic.

Can you give me a code example of the Observer pattern?

Absolutely! The Observer pattern allows an object to notify other objects about changes in its state. Here's a simple example:

class Subject {
    constructor() {
        this.observers = [];
    }
    addObserver(observer) {
        this.observers.push(observer);
    }
    notifyObservers(data) {
        this.observers.forEach(observer => observer.update(data));
    }
}

class Observer {
    update(data) {
        console.log('Observer received data:', data);
    }
}

const subject = new Subject();
const observer1 = new Observer();
subject.addObserver(observer1);
subject.notifyObservers('Hello Observers!');

This code demonstrates how observers can be notified of changes.