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series.js 5.69 KiB
'use strict';
Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = series;
var _parallel2 = require('./internal/parallel.js');
var _parallel3 = _interopRequireDefault(_parallel2);
var _eachOfSeries = require('./eachOfSeries.js');
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|AsyncIterable|Object} tasks - A collection containing
 * [async functions]{@link AsyncFunction} to run in series.
 * Each function can complete with any number of optional `result` values.
 * @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).
 * @return {Promise} a promise, if no callback is passed
 * @example
 * //Using Callbacks
 * async.series([
 *     function(callback) {
 *         setTimeout(function() {
 *             // do some async task
 *             callback(null, 'one');
 *         }, 200);
 *     },
 *     function(callback) {
 *         setTimeout(function() {
 *             // then do another async task
 *             callback(null, 'two');
 *         }, 100);
 *     }
 * ], function(err, results) {
 *     console.log(results);
 *     // results is equal to ['one','two']
* }); * * // an example using objects instead of arrays * async.series({ * one: function(callback) { * setTimeout(function() { * // do some async task * callback(null, 1); * }, 200); * }, * two: function(callback) { * setTimeout(function() { * // then do another async task * callback(null, 2); * }, 100); * } * }, function(err, results) { * console.log(results); * // results is equal to: { one: 1, two: 2 } * }); * * //Using Promises * async.series([ * function(callback) { * setTimeout(function() { * callback(null, 'one'); * }, 200); * }, * function(callback) { * setTimeout(function() { * callback(null, 'two'); * }, 100); * } * ]).then(results => { * console.log(results); * // results is equal to ['one','two'] * }).catch(err => { * console.log(err); * }); * * // an example using an object instead of an array * async.series({ * one: function(callback) { * setTimeout(function() { * // do some async task * callback(null, 1); * }, 200); * }, * two: function(callback) { * setTimeout(function() { * // then do another async task * callback(null, 2); * }, 100); * } * }).then(results => { * console.log(results); * // results is equal to: { one: 1, two: 2 } * }).catch(err => { * console.log(err); * }); * * //Using async/await * async () => { * try { * let results = await async.series([ * function(callback) { * setTimeout(function() { * // do some async task * callback(null, 'one'); * }, 200);
* }, * function(callback) { * setTimeout(function() { * // then do another async task * callback(null, 'two'); * }, 100); * } * ]); * console.log(results); * // results is equal to ['one','two'] * } * catch (err) { * console.log(err); * } * } * * // an example using an object instead of an array * async () => { * try { * let results = await async.parallel({ * one: function(callback) { * setTimeout(function() { * // do some async task * callback(null, 1); * }, 200); * }, * two: function(callback) { * setTimeout(function() { * // then do another async task * callback(null, 2); * }, 100); * } * }); * console.log(results); * // results is equal to: { one: 1, two: 2 } * } * catch (err) { * console.log(err); * } * } * */ function series(tasks, callback) { return (0, _parallel3.default)(_eachOfSeries2.default, tasks, callback); } module.exports = exports['default'];