JavaScript: Library Agnostic Pub/Sub

gistfile1

App = {};
App.cache = {};
App.publish = function(topic, args){
    App.cache[topic] && $.each(App.cache[topic], function(){
        this.apply($, args || []);
    });
};
App.subscribe = function(topic, callback){
    if(!App.cache[topic]){
        App.cache[topic] = [];
    }
    App.cache[topic].push(callback);
    return [topic, callback];
};
App.unsubscribe = function(handle){
    var t = handle[0];
    App.cache[t] && $.each(App.cache[t], function(idx){
        if(this == handle[1]){
            App.cache[t].splice(idx, 1);
        }
    });
};