1  'use strict';
 2  
 3  Object.defineProperty(exports, "__esModule", {
 4    value: true
 5  });
 6  exports.default = series;
 7  
 8  var _parallel2 = require('./internal/parallel');
 9  
10  var _parallel3 = _interopRequireDefault(_parallel2);
11  
12  var _eachOfSeries = require('./eachOfSeries');
13  
14  var _eachOfSeries2 = _interopRequireDefault(_eachOfSeries);
15  
16  function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
17  
18  /**
19   * Run the functions in the `tasks` collection in series, each one running once
20   * the previous function has completed. If any functions in the series pass an
21   * error to its callback, no more functions are run, and `callback` is
22   * immediately called with the value of the error. Otherwise, `callback`
23   * receives an array of results when `tasks` have completed.
24   *
25   * It is also possible to use an object instead of an array. Each property will
26   * be run as a function, and the results will be passed to the final `callback`
27   * as an object instead of an array. This can be a more readable way of handling
28   *  results from {@link async.series}.
29   *
30   * **Note** that while many implementations preserve the order of object
31   * properties, the [ECMAScript Language Specification](http://www.ecma-international.org/ecma-262/5.1/#sec-8.6)
32   * explicitly states that
33   *
34   * > The mechanics and order of enumerating the properties is not specified.
35   *
36   * So if you rely on the order in which your series of functions are executed,
37   * and want this to work on all platforms, consider using an array.
38   *
39   * @name series
40   * @static
41   * @memberOf module:ControlFlow
42   * @method
43   * @category Control Flow
44   * @param {Array|Iterable|AsyncIterable|Object} tasks - A collection containing
45   * [async functions]{@link AsyncFunction} to run in series.
46   * Each function can complete with any number of optional `result` values.
47   * @param {Function} [callback] - An optional callback to run once all the
48   * functions have completed. This function gets a results array (or object)
49   * containing all the result arguments passed to the `task` callbacks. Invoked
50   * with (err, result).
51   * @return {Promise} a promise, if no callback is passed
52   * @example
53   * async.series([
54   *     function(callback) {
55   *         // do some stuff ...
56   *         callback(null, 'one');
57   *     },
58   *     function(callback) {
59   *         // do some more stuff ...
60   *         callback(null, 'two');
61   *     }
62   * ],
63   * // optional callback
64   * function(err, results) {
65   *     // results is now equal to ['one', 'two']
66   * });
67   *
68   * async.series({
69   *     one: function(callback) {
70   *         setTimeout(function() {
71   *             callback(null, 1);
72   *         }, 200);
73   *     },
74   *     two: function(callback){
75   *         setTimeout(function() {
76   *             callback(null, 2);
77   *         }, 100);
78   *     }
79   * }, function(err, results) {
80   *     // results is now equal to: {one: 1, two: 2}
81   * });
82   */
83  function series(tasks, callback) {
84    return (0, _parallel3.default)(_eachOfSeries2.default, tasks, callback);
85  }
86  module.exports = exports['default'];