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1# run-parallel [![travis][travis-image]][travis-url] [![npm][npm-image]][npm-url] [![downloads][downloads-image]][downloads-url] [![javascript style guide][standard-image]][standard-url]
2
3[travis-image]: https://img.shields.io/travis/feross/run-parallel/master.svg
4[travis-url]: https://travis-ci.org/feross/run-parallel
5[npm-image]: https://img.shields.io/npm/v/run-parallel.svg
6[npm-url]: https://npmjs.org/package/run-parallel
7[downloads-image]: https://img.shields.io/npm/dm/run-parallel.svg
8[downloads-url]: https://npmjs.org/package/run-parallel
9[standard-image]: https://img.shields.io/badge/code_style-standard-brightgreen.svg
10[standard-url]: https://standardjs.com
11
12### Run an array of functions in parallel
13
14![parallel](https://raw.githubusercontent.com/feross/run-parallel/master/img.png) [![Sauce Test Status](https://saucelabs.com/browser-matrix/run-parallel.svg)](https://saucelabs.com/u/run-parallel)
15
16### install
17
18```
19npm install run-parallel
20```
21
22### usage
23
24#### parallel(tasks, [callback])
25
26Run the `tasks` array of functions in parallel, without waiting until the previous
27function has completed. If any of the functions pass an error to its callback, the main
28`callback` is immediately called with the value of the error. Once the `tasks` have
29completed, the results are passed to the final `callback` as an array.
30
31It is also possible to use an object instead of an array. Each property will be run as a
32function and the results will be passed to the final `callback` as an object instead of
33an array. This can be a more readable way of handling the results.
34
35##### arguments
36
37- `tasks` - An array or object containing functions to run. Each function is passed a
38`callback(err, result)` which it must call on completion with an error `err` (which can
39be `null`) and an optional `result` value.
40- `callback(err, results)` - An optional callback to run once all the functions have
41completed. This function gets a results array (or object) containing all the result
42arguments passed to the task callbacks.
43
44##### example
45
46```js
47var parallel = require('run-parallel')
48
49parallel([
50 function (callback) {
51 setTimeout(function () {
52 callback(null, 'one')
53 }, 200)
54 },
55 function (callback) {
56 setTimeout(function () {
57 callback(null, 'two')
58 }, 100)
59 }
60],
61// optional callback
62function (err, results) {
63 // the results array will equal ['one','two'] even though
64 // the second function had a shorter timeout.
65})
66```
67
68This module is basically equavalent to
69[`async.parallel`](https://github.com/caolan/async#paralleltasks-callback), but it's
70handy to just have the one function you need instead of the kitchen sink. Modularity!
71Especially handy if you're serving to the browser and need to reduce your javascript
72bundle size.
73
74Works great in the browser with [browserify](http://browserify.org/)!
75
76### see also
77
78- [run-auto](https://github.com/feross/run-auto)
79- [run-parallel-limit](https://github.com/feross/run-parallel-limit)
80- [run-series](https://github.com/feross/run-series)
81- [run-waterfall](https://github.com/feross/run-waterfall)
82
83### license
84
85MIT. Copyright (c) [Feross Aboukhadijeh](http://feross.org).
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