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publisherSubscriber.js
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publisherSubscriber.js
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class Publisher {
constructor() {
this.subscribers = {};
}
subsribe(topic, callback) {
if (!this.subscribers.hasOwnProperty(topic)) this.subscribers[topic] = [];
this.subscribers[topic].push(callback);
return {
unsubscribe: () => {
this.subscribers = {
...this.subscribers,
[topic]: this.subscribers[topic].filter(cb => cb !== callback)
}
}
}
}
publish(topic, ...args) {
(this.subscribers[topic] || []).forEach(cb => {
cb(...args);
})
}
}
const myPublisher = new Publisher();
const topic1 = "topic1", topic2 = "topic2";
const subscriber1 = myPublisher.subsribe(topic1, function(...args) {
console.log("subscriber1 receives:", ...args);
});
const subscriber2 = myPublisher.subsribe(topic1, function(...args) {
console.log("subscriber2 receives:", ...args);
});
const subscriber3 = myPublisher.subsribe(topic2, function(...args) {
console.log("subscriber3 receives:", ...args);
});
console.log("\n")
myPublisher.publish(topic1, "1 data arrives");
subscriber1.unsubscribe();
console.log("\n")
myPublisher.publish(topic2, "2 data arrives");