Observer

Info

Observer is a behavioral design pattern that lets you define a subscription mechanism to notify multiple objects about any events that happen to the object they’re observing.

Refactoring Guru: Observer

Kunkun does not implement any observer pattern yet, but it depends on Svelte store. Svelte store has a subscribe() method.

import { writable } from 'svelte/store';
 
const count = writable(0);
 
count.subscribe((value) => {
	console.log(value);
}); // logs '0'
 
count.set(1); // logs '1'
 
count.update((n) => n + 1); // logs '2'