Simple queue

queue.js

define('helpers/queue', function() {
    var Queue = {};
    Queue.items = [];
    Queue.enqueue = function(process) {
        var id = Queue.items.push(process);
        setTimeout(function() {
            Queue.update(id);
        }, 0);
    };

    Queue.update = function update(id) {
        if (Queue.items.length < 1 || this.id) return;

        var process = Queue.items.shift();

        if (!process) return console.log('process no process');

        this.id = id;

        process(function() {
            this.id = null;
            this.update();
        }.bind(this));
    };

    return Queue;
});