PublishSubscriberPattern Implementation - basic

PublishSubscribeImpl.js

// test gist http://jsfiddle.net/fJPkr/1/

var handler = {};
(function(h){
    //holds the topics
    var topics = {},
        subUid = 0;
    
    h.publish = function(topic, args){
        //only publish topics that were subscribed to
        if(!topics[topic]){
            return false;
        }
        
        var subs = topics[topic],
            len = subs ? subs.length : 0;
        
        while(len--){
            subs[len].func(topic, args)
        }
        
        //enable chaining
        return this;
    };
    
    h.subscribe = function( topic, func ){
        if(!topics[topic]){
            topics[topic] = [];
        }
        
        var token = ( ++subUid ).toString();
        
        topics[topic].push({
            token : token,
            func : func
        });
        
        return token;
    };
    
    h.unsubscribe = function(token){
        for(var m in topics){
            if(topics[m]){
                for(var i = 0; i < topics[m].length; i++){
                    if(topics[m][i].token === token){
                        //remove this subscription from the topics
                        topics[m].splice(i, 1);
                        return token;
                    }
                }
            }
        }
        return this;
    };

})(handler);

console.log(handler);

var subscriptionToken = handler.subscribe('test/sub', function(){
    console.log('publish called');
});

handler.publish('test/sub');
handler.publish('test/sub');

handler.unsubscribe(subscriptionToken);

handler.publish('test/sub');