Basic Javascript PubSub Pattern

pubsub.js

// Event - a super-basic Javascript (publish subscribe) pattern

var Event = {
    event: {},
    
    listen: function (eventName, fn) {
        this.event[eventName] = this.event[eventName] || [];
        this.event[eventName].push(fn);
    },
    
    forget: function(eventName, fn) {
        if (this.event[eventName]) {
            for (var i=0; i < this.event[eventName].length; i++) {
                if (this.event[eventName][i] === fn) {
                    this.event[eventName].splice(i, 1);
                    break;
                }
            };
        }
    },
    
    fire: function (eventName, data) {
        if (this.event[eventName]) {
            this.event[eventName].forEach(function(fn) {
                fn(data);
            });
        }
    }
};