HORIZON PROJECT

'use strict';

Object.defineProperty(exports, "__esModule", {

  value: true

});

exports.default = series;

var _parallel = require('./internal/parallel');

var _parallel2 = _interopRequireDefault(_parallel);

var _eachOfSeries = require('./eachOfSeries');

var _eachOfSeries2 = _interopRequireDefault(_eachOfSeries);

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

/**

 * Run the functions in the `tasks` collection in series, each one running once

 * the previous function has completed. If any functions in the series pass an

 * error to its callback, no more functions are run, and `callback` is

 * immediately called with the value of the error. Otherwise, `callback`

 * receives an array of results when `tasks` have completed.

 *

 * It is also possible to use an object instead of an array. Each property will

 * be run as a function, and the results will be passed to the final `callback`

 * as an object instead of an array. This can be a more readable way of handling

 *  results from {@link async.series}.

 *

 * **Note** that while many implementations preserve the order of object

 * properties, the [ECMAScript Language Specification](http://www.ecma-international.org/ecma-262/5.1/#sec-8.6)

 * explicitly states that

 *

 * > The mechanics and order of enumerating the properties is not specified.

 *

 * So if you rely on the order in which your series of functions are executed,

 * and want this to work on all platforms, consider using an array.

 *

 * @name series

 * @static

 * @memberOf module:ControlFlow

 * @method

 * @category Control Flow

 * @param {Array|Iterable|Object} tasks - A collection containing functions to run, each

 * function is passed a `callback(err, result)` it must call on completion with

 * an error `err` (which can be `null`) and an optional `result` value.

 * @param {Function} [callback] - An optional callback to run once all the

 * functions have completed. This function gets a results array (or object)

 * containing all the result arguments passed to the `task` callbacks. Invoked

 * with (err, result).

 * @example

 * async.series([

 *     function(callback) {

 *         // do some stuff ...

 *         callback(null, 'one');

 *     },

 *     function(callback) {

 *         // do some more stuff ...

 *         callback(null, 'two');

 *     }

 * ],

 * // optional callback

 * function(err, results) {

 *     // results is now equal to ['one', 'two']

 * });

 *

 * async.series({

 *     one: function(callback) {

 *         setTimeout(function() {

 *             callback(null, 1);

 *         }, 200);

 *     },

 *     two: function(callback){

 *         setTimeout(function() {

 *             callback(null, 2);

 *         }, 100);

 *     }

 * }, function(err, results) {

 *     // results is now equal to: {one: 1, two: 2}

 * });

 */

function series(tasks, callback) {

  (0, _parallel2.default)(_eachOfSeries2.default, tasks, callback);

}

module.exports = exports['default'];