jQuery Sequential Deferred

gistfile1.js

    var persistUploads = function () {
        var deferred = $.Deferred(),
            persistQueue = [];

        for (var type in Behaviour.Uploads.files) {

            Behaviour.Uploads.files[type].sort(function(a,b) { return a.order - b.order; });

            var image;
            for (var a = 0; a < Behaviour.Uploads.files[type].length; a++) {
                image = Behaviour.Uploads.files[type][a];

                if (image.status === STATUS_PERSIST) {
                    persistQueue.push(Behaviour.Uploads.insertUpload(image));
                }
            }

            for (var b = 0; b < Behaviour.Uploads.files[type].length; b++) {
                image = Behaviour.Uploads.files[type][b];

                if (image.status === STATUS_UPDATE) {
                    persistQueue.push(Behaviour.Uploads.updateUpload(image));
                }
            }

            for (var c = 0; c < Behaviour.Uploads.files[type].length; c++) {
                image = Behaviour.Uploads.files[type][c];

                if (image.status === STATUS_DELETE) {
                    persistQueue.push(Behaviour.Uploads.deleteUpload(image));
                }
            }
        }

        $.when.apply($, persistQueue).then(function() {
            deferred.resolve();
        });

        return deferred.promise();
    };