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<h1 class="page-title">series.js</h1>
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<article>
<pre class="prettyprint source linenums"><code>import _parallel from './internal/parallel.js'
import eachOfSeries from './eachOfSeries.js'
/**
* 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);
* }
* }
*
*/
export default function series(tasks, callback) {
return _parallel(eachOfSeries, tasks, callback);
}
</code></pre>
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<h3>Methods:</h3><ul class="nav methods"><li class="toc-header"><a href="docs.html#collections">Collections</a></li><li data-type="method" class="toc-method"><a href="docs.html#concat">concat</a></li><li data-type="method" class="toc-method"><a href="docs.html#concatLimit">concatLimit</a></li><li data-type="method" class="toc-method"><a href="docs.html#concatSeries">concatSeries</a></li><li data-type="method" class="toc-method"><a href="docs.html#detect">detect</a></li><li data-type="method" class="toc-method"><a href="docs.html#detectLimit">detectLimit</a></li><li data-type="method" class="toc-method"><a href="docs.html#detectSeries">detectSeries</a></li><li data-type="method" class="toc-method"><a href="docs.html#each">each</a></li><li data-type="method" class="toc-method"><a href="docs.html#eachLimit">eachLimit</a></li><li data-type="method" class="toc-method"><a href="docs.html#eachOf">eachOf</a></li><li data-type="method" class="toc-method"><a href="docs.html#eachOfLimit">eachOfLimit</a></li><li data-type="method" class="toc-method"><a href="docs.html#eachOfSeries">eachOfSeries</a></li><li data-type="method" class="toc-method"><a href="docs.html#eachSeries">eachSeries</a></li><li data-type="method" class="toc-method"><a href="docs.html#every">every</a></li><li data-type="method" class="toc-method"><a href="docs.html#everyLimit">everyLimit</a></li><li data-type="method" class="toc-method"><a href="docs.html#everySeries">everySeries</a></li><li data-type="method" class="toc-method"><a href="docs.html#filter">filter</a></li><li data-type="method" class="toc-method"><a href="docs.html#filterLimit">filterLimit</a></li><li data-type="method" class="toc-method"><a href="docs.html#filterSeries">filterSeries</a></li><li data-type="method" class="toc-method"><a href="docs.html#groupBy">groupBy</a></li><li data-type="method" class="toc-method"><a href="docs.html#groupByLimit">groupByLimit</a></li><li data-type="method" class="toc-method"><a href="docs.html#groupBySeries">groupBySeries</a></li><li data-type="method" class="toc-method"><a href="docs.html#map">map</a></li><li data-type="method" class="toc-method"><a href="docs.html#mapLimit">mapLimit</a></li><li data-type="method" class="toc-method"><a href="docs.html#mapSeries">mapSeries</a></li><li data-type="method" class="toc-method"><a href="docs.html#mapValues">mapValues</a></li><li data-type="method" class="toc-method"><a href="docs.html#mapValuesLimit">mapValuesLimit</a></li><li data-type="method" class="toc-method"><a href="docs.html#mapValuesSeries">mapValuesSeries</a></li><li data-type="method" class="toc-method"><a href="docs.html#reduce">reduce</a></li><li data-type="method" class="toc-method"><a href="docs.html#reduceRight">reduceRight</a></li><li data-type="method" class="toc-method"><a href="docs.html#reject">reject</a></li><li data-type="method" class="toc-method"><a href="docs.html#rejectLimit">rejectLimit</a></li><li 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href="docs.html#retry">retry</a></li><li data-type="method" class="toc-method"><a href="docs.html#retryable">retryable</a></li><li data-type="method" class="toc-method"><a href="docs.html#seq">seq</a></li><li data-type="method" class="toc-method active"><a href="docs.html#series">series</a></li><li data-type="method" class="toc-method"><a href="docs.html#times">times</a></li><li data-type="method" class="toc-method"><a href="docs.html#timesLimit">timesLimit</a></li><li data-type="method" class="toc-method"><a href="docs.html#timesSeries">timesSeries</a></li><li data-type="method" class="toc-method"><a href="docs.html#tryEach">tryEach</a></li><li data-type="method" class="toc-method"><a href="docs.html#until">until</a></li><li data-type="method" class="toc-method"><a href="docs.html#waterfall">waterfall</a></li><li data-type="method" class="toc-method"><a href="docs.html#whilst">whilst</a></li><li class="toc-header"><a href="docs.html#utils">Utils</a></li><li data-type="method" class="toc-method"><a href="docs.html#apply">apply</a></li><li data-type="method" class="toc-method"><a href="docs.html#asyncify">asyncify</a></li><li data-type="method" class="toc-method"><a href="docs.html#constant">constant</a></li><li data-type="method" class="toc-method"><a href="docs.html#dir">dir</a></li><li data-type="method" class="toc-method"><a href="docs.html#ensureAsync">ensureAsync</a></li><li data-type="method" class="toc-method"><a href="docs.html#log">log</a></li><li data-type="method" class="toc-method"><a href="docs.html#memoize">memoize</a></li><li data-type="method" class="toc-method"><a href="docs.html#nextTick">nextTick</a></li><li data-type="method" class="toc-method"><a href="docs.html#reflect">reflect</a></li><li data-type="method" class="toc-method"><a href="docs.html#reflectAll">reflectAll</a></li><li data-type="method" class="toc-method"><a href="docs.html#setImmediate">setImmediate</a></li><li data-type="method" class="toc-method"><a href="docs.html#timeout">timeout</a></li><li data-type="method" class="toc-method"><a href="docs.html#unmemoize">unmemoize</a></li></ul><h3>Methods:</h3>
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