Javascript: Delayed Function Queue

gistfile1.txt

/* Core Methods */
var TimedQueue = function(defaultDelay){
    this.queue = [];
    this.index = 0;
    this.defaultDelay = defaultDelay || 3000;
};

TimedQueue.prototype = {
    add: function(fn, delay){
        this.queue.push({
            fn: fn,
            delay: delay
        });
    },
    run: function(index){
        (index || index === 0) && (this.index = index);
        this.next();
    },
    next: function(){
        var self = this
        , i = this.index++
        , at = this.queue[i]
        , next = this.queue[this.index]
        if(!at) return;
        at.fn();
        next && setTimeout(function(){
            self.next();
        }, next.delay||this.defaultDelay);
    },
    reset: function(){
        this.index = 0;
    }
}


/* Test code: */

var queueStart  = +new Date();
var q = new TimedQueue(2000);

q.add(function(){
    console.log('hey');
    console.log(+new Date() - queueStart);
});
q.add(function(){
    console.log('ho');
    console.log(+new Date() - queueStart);
}, 3000);
quickMode.add(function(){
    console.log('bye');
    console.log(+new Date() - queueStart);
});

q.run();