JSFiddle - React, Tailwind, and code Playground

by secretgspot

HTML

<h1>Observer pattern Pub/Sub example</h1>

JavaScript

/*!
* Pub/Sub implementation
* http://addyosmani.com/
* Licensed under the GPL
*/

var pubsubz = {};
(function(q) {

    var topics = {},
        subUid = -1;

    q.publish = function(topic, args) {

        if (!topics[topic]) {
            return false;
        }

        setTimeout(function() {
            var subscribers = topics[topic],
                len = subscribers ? subscribers.length : 0;

            while (len--) {
                subscribers[len].func(topic, args);
            }
        }, 0);

        return true;

    };

    q.subscribe = function(topic, func) {

        if (!topics[topic]) {
            topics[topic] = [];
        }

        var token = (++subUid).toString();
        topics[topic].push({
            token: token,
            func: func
        });
        return token;
    };

    q.unsubscribe = function(token) {
        for (var m in topics) {
            if (topics[m]) {
                for (var i = 0, j = topics[m].length; i < j; i++) {
                    if (topics[m][i].token === token) {
                        topics[m].splice(i, 1);
                        return token;
                    }
                }
            }
        }
        return false;
    };
}(pubsubz));



var testSubscriber = function(topics, data) {
    console.log(topics + ": " + data);
};

var testSubscription = pubsubz.subscribe('example1', testSubscriber);

pubsubz.publish('example1', 'hello world!');
pubsubz.publish('example1', ['test', 'a', 'b', 'c']);
pubsubz.publish('example1', [{
    'color': 'blue'},
{
    'text': 'hello'}]);

setTimeout(function() {
    pubsubz.unsubscribe(testSubscription);
}, 0);

pubsubz.publish('example1', 'hello again!');