Function sequentialize

lib/index.js:7876–7884

(queue, promiseFactory)

}

function sequentialize(queue, promiseFactory) {
  return function () {
    var args = arguments;
    var that = this;
    return queue.add(function () {
      return promiseFactory.apply(that, args);
    });
  };
}

// uniq an array of strings, order not guaranteed
// similar to underscore/lodash _.uniq