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var Users = {
    list: [],
    listeners: {},
    add: function(name) {
        this.list.push({name: name});
        this.dispatch("user-added");
    },
    on: function(eventName, listener) {
        if(!this.listeners[eventName]) this.listeners[eventName] = [];
        this.listeners[eventName].push(listener);
    },
    dispatch: function(eventName) {
        if(this.listeners[eventName]) {
            for(var i=0; i < this.listeners[eventName].length; i++) {
                this.listeners[eventName][i](this);
            }
        }
    },
    numOfAddedUsers: function() {
        return this.list.length;
    }
};
 
Users.on("user-added", function() {
    console.log(Users.numOfAddedUsers());
});
 
Users.add("Bob");
Users.add("John");