> For the complete documentation index, see [llms.txt](https://bryan-guner.gitbook.io/my-docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://bryan-guner.gitbook.io/my-docs/redux/repos/examples/real-world/node_modules/neo-async.md).

# Neo-Async

![](https://raw.githubusercontent.com/wiki/suguru03/neo-async/images/neo_async_v2.png)

[![npm](https://img.shields.io/npm/v/neo-async.svg)](https://www.npmjs.com/package/neo-async) [![Travis Status](https://img.shields.io/travis/suguru03/neo-async.svg)](https://travis-ci.org/suguru03/neo-async) [![Coverage Status](https://img.shields.io/codecov/c/github/suguru03/neo-async/master.svg)](https://codecov.io/gh/suguru03/neo-async) [![download](https://img.shields.io/npm/dm/neo-async.svg)](https://www.npmjs.com/package/neo-async) [![Code Quality: Javascript](https://img.shields.io/lgtm/grade/javascript/g/suguru03/neo-async.svg?logo=lgtm\&logoWidth=18)](https://lgtm.com/projects/g/suguru03/neo-async/context:javascript) [![Total Alerts](https://img.shields.io/lgtm/alerts/g/suguru03/neo-async.svg?logo=lgtm\&logoWidth=18)](https://lgtm.com/projects/g/suguru03/neo-async/alerts) [![FOSSA](https://app.fossa.io/api/projects/git%2Bgithub.com%2Fsuguru03%2Fneo-async.svg?type=shield)](https://app.fossa.io/projects/git%2Bgithub.com%2Fsuguru03%2Fneo-async?ref=badge_shield)

Neo-Async is thought to be used as a drop-in replacement for [Async](https://github.com/caolan/async), it almost fully covers its functionality and runs [faster](#benchmark).

Benchmark is [here](#benchmark)!

Bluebird's benchmark is [here](https://github.com/suguru03/bluebird/tree/aigle/benchmark)!

## Code Coverage

![coverage](https://raw.githubusercontent.com/wiki/suguru03/neo-async/images/coverage.png)

## Installation

### In a browser

```html
<script src="async.min.js"></script>
```

### In an AMD loader

```js
require(['async'], function(async) {});
```

### Promise and async/await

I recommend to use [`Aigle`](https://github.com/suguru03/aigle).

It is optimized for Promise handling and has almost the same functionality as `neo-async`.

### Node.js

#### standard

```bash
$ npm install neo-async
```

```js
var async = require('neo-async');
```

#### replacement

```bash
$ npm install neo-async
$ ln -s ./node_modules/neo-async ./node_modules/async
```

```js
var async = require('async');
```

### Bower

```bash
bower install neo-async
```

## Feature

[JSDoc](http://suguru03.github.io/neo-async/doc/async.html)

\* not in Async

### Collections

* [`each`](http://suguru03.github.io/neo-async/doc/async.each.html)
* [`eachSeries`](http://suguru03.github.io/neo-async/doc/async.eachSeries.html)
* [`eachLimit`](http://suguru03.github.io/neo-async/doc/async.eachLimit.html)
* [`forEach`](http://suguru03.github.io/neo-async/doc/async.each.html) -> [`each`](http://suguru03.github.io/neo-async/doc/async.each.html)
* [`forEachSeries`](http://suguru03.github.io/neo-async/doc/async.eachSeries.html) -> [`eachSeries`](http://suguru03.github.io/neo-async/doc/async.eachSeries.html)
* [`forEachLimit`](http://suguru03.github.io/neo-async/doc/async.eachLimit.html) -> [`eachLimit`](http://suguru03.github.io/neo-async/doc/async.eachLimit.html)
* [`eachOf`](http://suguru03.github.io/neo-async/doc/async.each.html) -> [`each`](http://suguru03.github.io/neo-async/doc/async.each.html)
* [`eachOfSeries`](http://suguru03.github.io/neo-async/doc/async.eachSeries.html) -> [`eachSeries`](http://suguru03.github.io/neo-async/doc/async.eachSeries.html)
* [`eachOfLimit`](http://suguru03.github.io/neo-async/doc/async.eachLimit.html) -> [`eachLimit`](http://suguru03.github.io/neo-async/doc/async.eachLimit.html)
* [`forEachOf`](http://suguru03.github.io/neo-async/doc/async.each.html) -> [`each`](http://suguru03.github.io/neo-async/doc/async.each.html)
* [`forEachOfSeries`](http://suguru03.github.io/neo-async/doc/async.eachSeries.html) -> [`eachSeries`](http://suguru03.github.io/neo-async/doc/async.eachSeries.html)
* [`eachOfLimit`](http://suguru03.github.io/neo-async/doc/async.eachLimit.html) -> [`forEachLimit`](http://suguru03.github.io/neo-async/doc/async.eachLimit.html)
* [`map`](http://suguru03.github.io/neo-async/doc/async.map.html)
* [`mapSeries`](http://suguru03.github.io/neo-async/doc/async.mapSeries.html)
* [`mapLimit`](http://suguru03.github.io/neo-async/doc/async.mapLimit.html)
* [`mapValues`](http://suguru03.github.io/neo-async/doc/async.mapValues.html)
* [`mapValuesSeries`](http://suguru03.github.io/neo-async/doc/async.mapValuesSeries.html)
* [`mapValuesLimit`](http://suguru03.github.io/neo-async/doc/async.mapValuesLimit.html)
* [`filter`](http://suguru03.github.io/neo-async/doc/async.filter.html)
* [`filterSeries`](http://suguru03.github.io/neo-async/doc/async.filterSeries.html)
* [`filterLimit`](http://suguru03.github.io/neo-async/doc/async.filterLimit.html)
* [`select`](http://suguru03.github.io/neo-async/doc/async.filter.html) -> [`filter`](http://suguru03.github.io/neo-async/doc/async.filter.html)
* [`selectSeries`](http://suguru03.github.io/neo-async/doc/async.filterSeries.html) -> [`filterSeries`](http://suguru03.github.io/neo-async/doc/async.filterSeries.html)
* [`selectLimit`](http://suguru03.github.io/neo-async/doc/async.filterLimit.html) -> [`filterLimit`](http://suguru03.github.io/neo-async/doc/async.filterLimit.html)
* [`reject`](http://suguru03.github.io/neo-async/doc/async.reject.html)
* [`rejectSeries`](http://suguru03.github.io/neo-async/doc/async.rejectSeries.html)
* [`rejectLimit`](http://suguru03.github.io/neo-async/doc/async.rejectLimit.html)
* [`detect`](http://suguru03.github.io/neo-async/doc/async.detect.html)
* [`detectSeries`](http://suguru03.github.io/neo-async/doc/async.detectSeries.html)
* [`detectLimit`](http://suguru03.github.io/neo-async/doc/async.detectLimit.html)
* [`find`](http://suguru03.github.io/neo-async/doc/async.detect.html) -> [`detect`](http://suguru03.github.io/neo-async/doc/async.detect.html)
* [`findSeries`](http://suguru03.github.io/neo-async/doc/async.detectSeries.html) -> [`detectSeries`](http://suguru03.github.io/neo-async/doc/async.detectSeries.html)
* [`findLimit`](http://suguru03.github.io/neo-async/doc/async.detectLimit.html) -> [`detectLimit`](http://suguru03.github.io/neo-async/doc/async.detectLimit.html)
* [`pick`](http://suguru03.github.io/neo-async/doc/async.pick.html) \*
* [`pickSeries`](http://suguru03.github.io/neo-async/doc/async.pickSeries.html) \*
* [`pickLimit`](http://suguru03.github.io/neo-async/doc/async.pickLimit.html) \*
* [`omit`](http://suguru03.github.io/neo-async/doc/async.omit.html) \*
* [`omitSeries`](http://suguru03.github.io/neo-async/doc/async.omitSeries.html) \*
* [`omitLimit`](http://suguru03.github.io/neo-async/doc/async.omitLimit.html) \*
* [`reduce`](http://suguru03.github.io/neo-async/doc/async.reduce.html)
* [`inject`](http://suguru03.github.io/neo-async/doc/async.reduce.html) -> [`reduce`](http://suguru03.github.io/neo-async/doc/async.reduce.html)
* [`foldl`](http://suguru03.github.io/neo-async/doc/async.reduce.html) -> [`reduce`](http://suguru03.github.io/neo-async/doc/async.reduce.html)
* [`reduceRight`](http://suguru03.github.io/neo-async/doc/async.reduceRight.html)
* [`foldr`](http://suguru03.github.io/neo-async/doc/async.reduceRight.html) -> [`reduceRight`](http://suguru03.github.io/neo-async/doc/async.reduceRight.html)
* [`transform`](http://suguru03.github.io/neo-async/doc/async.transform.html)
* [`transformSeries`](http://suguru03.github.io/neo-async/doc/async.transformSeries.html) \*
* [`transformLimit`](http://suguru03.github.io/neo-async/doc/async.transformLimit.html) \*
* [`sortBy`](http://suguru03.github.io/neo-async/doc/async.sortBy.html)
* [`sortBySeries`](http://suguru03.github.io/neo-async/doc/async.sortBySeries.html) \*
* [`sortByLimit`](http://suguru03.github.io/neo-async/doc/async.sortByLimit.html) \*
* [`some`](http://suguru03.github.io/neo-async/doc/async.some.html)
* [`someSeries`](http://suguru03.github.io/neo-async/doc/async.someSeries.html)
* [`someLimit`](http://suguru03.github.io/neo-async/doc/async.someLimit.html)
* [`any`](http://suguru03.github.io/neo-async/doc/async.some.html) -> [`some`](http://suguru03.github.io/neo-async/doc/async.some.html)
* [`anySeries`](http://suguru03.github.io/neo-async/doc/async.someSeries.html) -> [`someSeries`](http://suguru03.github.io/neo-async/doc/async.someSeries.html)
* [`anyLimit`](http://suguru03.github.io/neo-async/doc/async.someLimit.html) -> [`someLimit`](http://suguru03.github.io/neo-async/doc/async.someLimit.html)
* [`every`](http://suguru03.github.io/neo-async/doc/async.every.html)
* [`everySeries`](http://suguru03.github.io/neo-async/doc/async.everySeries.html)
* [`everyLimit`](http://suguru03.github.io/neo-async/doc/async.everyLimit.html)
* [`all`](http://suguru03.github.io/neo-async/doc/async.every.html) -> [`every`](http://suguru03.github.io/neo-async/doc/async.every.html)
* [`allSeries`](http://suguru03.github.io/neo-async/doc/async.everySeries.html) -> [`every`](http://suguru03.github.io/neo-async/doc/async.everySeries.html)
* [`allLimit`](http://suguru03.github.io/neo-async/doc/async.everyLimit.html) -> [`every`](http://suguru03.github.io/neo-async/doc/async.everyLimit.html)
* [`concat`](http://suguru03.github.io/neo-async/doc/async.concat.html)
* [`concatSeries`](http://suguru03.github.io/neo-async/doc/async.concatSeries.html)
* [`concatLimit`](http://suguru03.github.io/neo-async/doc/async.concatLimit.html) \*

### Control Flow

* [`parallel`](http://suguru03.github.io/neo-async/doc/async.parallel.html)
* [`series`](http://suguru03.github.io/neo-async/doc/async.series.html)
* [`parallelLimit`](http://suguru03.github.io/neo-async/doc/async.series.html)
* [`tryEach`](http://suguru03.github.io/neo-async/doc/async.tryEach.html)
* [`waterfall`](http://suguru03.github.io/neo-async/doc/async.waterfall.html)
* [`angelFall`](http://suguru03.github.io/neo-async/doc/async.angelFall.html) \*
* [`angelfall`](http://suguru03.github.io/neo-async/doc/async.angelFall.html) -> [`angelFall`](http://suguru03.github.io/neo-async/doc/async.angelFall.html) \*
* [`whilst`](#whilst)
* [`doWhilst`](#doWhilst)
* [`until`](#until)
* [`doUntil`](#doUntil)
* [`during`](#during)
* [`doDuring`](#doDuring)
* [`forever`](#forever)
* [`compose`](#compose)
* [`seq`](#seq)
* [`applyEach`](#applyEach)
* [`applyEachSeries`](#applyEachSeries)
* [`queue`](#queue)
* [`priorityQueue`](#priorityQueue)
* [`cargo`](#cargo)
* [`auto`](#auto)
* [`autoInject`](#autoInject)
* [`retry`](#retry)
* [`retryable`](#retryable)
* [`iterator`](#iterator)
* [`times`](http://suguru03.github.io/neo-async/doc/async.times.html)
* [`timesSeries`](http://suguru03.github.io/neo-async/doc/async.timesSeries.html)
* [`timesLimit`](http://suguru03.github.io/neo-async/doc/async.timesLimit.html)
* [`race`](#race)

### Utils

* [`apply`](#apply)
* [`setImmediate`](#setImmediate)
* [`nextTick`](#nextTick)
* [`memoize`](#memoize)
* [`unmemoize`](#unmemoize)
* [`ensureAsync`](#ensureAsync)
* [`constant`](#constant)
* [`asyncify`](#asyncify)
* [`wrapSync`](#asyncify) -> [`asyncify`](#asyncify)
* [`log`](#log)
* [`dir`](#dir)
* [`timeout`](http://suguru03.github.io/neo-async/doc/async.timeout.html)
* [`reflect`](#reflect)
* [`reflectAll`](#reflectAll)
* [`createLogger`](#createLogger)

## Mode

* [`safe`](#safe) \*
* [`fast`](#fast) \*

## Benchmark

[Benchmark: Async vs Neo-Async](http://suguru03.hatenablog.com/entry/2016/06/10/135559)

### How to check

```bash
$ node perf
```

### Environment

* Darwin 17.3.0 x64
* Node.js v8.9.4
* async v2.6.0
* neo-async v2.5.0
* benchmark v2.1.4

### Result

The value is the ratio (Neo-Async/Async) of the average speed.

#### Collections

| function                 | benchmark |
| ------------------------ | --------: |
| each/forEach             |      2.43 |
| eachSeries/forEachSeries |      1.75 |
| eachLimit/forEachLimit   |      1.68 |
| eachOf                   |      3.29 |
| eachOfSeries             |      1.50 |
| eachOfLimit              |      1.59 |
| map                      |      3.95 |
| mapSeries                |      1.81 |
| mapLimit                 |      1.27 |
| mapValues                |      2.73 |
| mapValuesSeries          |      1.59 |
| mapValuesLimit           |      1.23 |
| filter                   |      3.00 |
| filterSeries             |      1.74 |
| filterLimit              |      1.17 |
| reject                   |      4.59 |
| rejectSeries             |      2.31 |
| rejectLimit              |      1.58 |
| detect                   |      4.30 |
| detectSeries             |      1.86 |
| detectLimit              |      1.32 |
| reduce                   |      1.82 |
| transform                |      2.46 |
| sortBy                   |      4.08 |
| some                     |      2.19 |
| someSeries               |      1.83 |
| someLimit                |      1.32 |
| every                    |      2.09 |
| everySeries              |      1.84 |
| everyLimit               |      1.35 |
| concat                   |      3.79 |
| concatSeries             |      4.45 |

#### Control Flow

| funciton  | benchmark |
| --------- | --------: |
| parallel  |      2.93 |
| series    |      1.96 |
| waterfall |      1.29 |
| whilst    |      1.00 |
| doWhilst  |      1.12 |
| until     |      1.12 |
| doUntil   |      1.12 |
| during    |      1.18 |
| doDuring  |      2.42 |
| times     |      4.25 |
| auto      |      1.97 |

## License

[![FOSSA Status](https://app.fossa.io/api/projects/git%2Bgithub.com%2Fsuguru03%2Fneo-async.svg?type=large)](https://app.fossa.io/projects/git%2Bgithub.com%2Fsuguru03%2Fneo-async?ref=badge_large)