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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>async - Documentation</title>
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<h1 class="page-title">async</h1>
<section>
<header>
</header>
<article>
<div class="container-overview">
<div class="description"><p>Async is a utility module which provides straight-forward, powerful functions
for working with asynchronous JavaScript. Although originally designed for
use with <a href="http://nodejs.org">Node.js</a> and installable via
<code>npm install --save async</code>, it can also be used directly in the browser.</p></div>
<dl class="details">
<dt class="tag-source">Source:</dt>
<dd class="tag-source"><ul class="dummy"><li>
<a href="index.js.html">index.js</a>, <a href="index.js.html#line1">line 1</a>
</li></ul></dd>
</dl>
</div>
</article>
</section>
<h1 class="page-title" id="collections">Collections</h1>
<section>
<header>
</header>
<article>
<div class="container-overview">
<div class="description"><p>A collection of <code>async</code> functions for manipulating collections, such as
arrays and objects.</p></div>
<dl class="details">
<dt class="tag-source">Source:</dt>
<dd class="tag-source"><ul class="dummy"><li>
<a href="index.js.html">index.js</a>, <a href="index.js.html#line9">line 9</a>
</li></ul></dd>
</dl>
</div>
<h3 class="subsection-title">Methods</h3>
<h4 class="name" id=".concat"><span class="type-signature">(static) </span>concat<span class="signature">(coll, iteratee, callback(err)<span class="signature-attributes">opt</span>)</span><span class="type-signature"></span></h4>
<div class="description">
<pre class="prettyprint source"><code>import concat from 'async/concat';</code></pre><p>Applies <code>iteratee</code> to each item in <code>coll</code>, concatenating the results. Returns
the concatenated list. The <code>iteratee</code>s are called in parallel, and the
results are concatenated as they return. There is no guarantee that the
results array will be returned in the original order of <code>coll</code> passed to the
<code>iteratee</code> function.</p>
</div>
<h5>Parameters:</h5>
<table class="params">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name"><code>coll</code></td>
<td class="type">
<span class="param-type">Array</span>
|
<span class="param-type">Iterable</span>
|
<span class="param-type">Object</span>
</td>
<td class="description last"><p>A collection to iterate over.</p></td>
</tr>
<tr>
<td class="name"><code>iteratee</code></td>
<td class="type">
<span class="param-type">function</span>
</td>
<td class="description last"><p>A function to apply to each item in <code>coll</code>.
The iteratee is passed a <code>callback(err, results)</code> which must be called once
it has completed with an error (which can be <code>null</code>) and an array of results.
Invoked with (item, callback).</p></td>
</tr>
<tr>
<td class="name"><code>callback(err)</code></td>
<td class="type">
<span class="param-type">function</span>
<span class="optional"><optional></span>
</td>
<td class="description last"><p>A callback which is called after all the
<code>iteratee</code> functions have finished, or an error occurs. Results is an array
containing the concatenated results of the <code>iteratee</code> function. Invoked with
(err, results).</p></td>
</tr>
</tbody>
</table>
<h5>Example</h5>
<pre class="prettyprint"><code>async.concat(['dir1','dir2','dir3'], fs.readdir, function(err, files) {
// files is now a list of filenames that exist in the 3 directories
});</code></pre>
<dl class="details">
<dt class="tag-source">Source:</dt>
<dd class="tag-source"><ul class="dummy"><li>
<a href="concat.js.html">concat.js</a>, <a href="concat.js.html#line4">line 4</a>
</li></ul></dd>
</dl>
<h4 class="name" id=".concatSeries"><span class="type-signature">(static) </span>concatSeries<span class="signature">(coll, iteratee, callback(err)<span class="signature-attributes">opt</span>)</span><span class="type-signature"></span></h4>
<div class="description">
<pre class="prettyprint source"><code>import concatSeries from 'async/concatSeries';</code></pre><p>The same as <a href="docs.html#.concat"><code>concat</code></a> but runs only a single async operation at a time.</p>
</div>
<h5>Parameters:</h5>
<table class="params">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name"><code>coll</code></td>
<td class="type">
<span class="param-type">Array</span>
|
<span class="param-type">Iterable</span>
|
<span class="param-type">Object</span>
</td>
<td class="description last"><p>A collection to iterate over.</p></td>
</tr>
<tr>
<td class="name"><code>iteratee</code></td>
<td class="type">
<span class="param-type">function</span>
</td>
<td class="description last"><p>A function to apply to each item in <code>coll</code>.
The iteratee is passed a <code>callback(err, results)</code> which must be called once
it has completed with an error (which can be <code>null</code>) and an array of results.
Invoked with (item, callback).</p></td>
</tr>
<tr>
<td class="name"><code>callback(err)</code></td>
<td class="type">
<span class="param-type">function</span>
<span class="optional"><optional></span>
</td>
<td class="description last"><p>A callback which is called after all the
<code>iteratee</code> functions have finished, or an error occurs. Results is an array
containing the concatenated results of the <code>iteratee</code> function. Invoked with
(err, results).</p></td>
</tr>
</tbody>
</table>
<dl class="details">
<dt class="tag-source">Source:</dt>
<dd class="tag-source"><ul class="dummy"><li>
<a href="concatSeries.js.html">concatSeries.js</a>, <a href="concatSeries.js.html#line4">line 4</a>
</li></ul></dd>
<dt class="tag-see">See:</dt>
<dd class="tag-see">
<ul>
<li><p><a href="docs.html#.concat">async.concat</a></p></li>
</ul>
</dd>
</dl>
<h4 class="name" id=".detect"><span class="type-signature">(static) </span>detect<span class="signature">(coll, iteratee, callback<span class="signature-attributes">opt</span>)</span><span class="type-signature"></span></h4>
<div class="description">
<pre class="prettyprint source"><code>import detect from 'async/detect';</code></pre><p>Returns the first value in <code>coll</code> that passes an async truth test. The
<code>iteratee</code> is applied in parallel, meaning the first iteratee to return
<code>true</code> will fire the detect <code>callback</code> with that result. That means the
result might not be the first item in the original <code>coll</code> (in terms of order)
that passes the test.
If order within the original <code>coll</code> is important, then look at
<a href="docs.html#.detectSeries"><code>detectSeries</code></a>.</p>
</div>
<dl class="details alias-details">
<dt class="tag-alias">Alias:</dt>
<dd class="tag-alias"><ul class="dummy"><li>find</li></ul></dd>
</dl>
<h5>Parameters:</h5>
<table class="params">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name"><code>coll</code></td>
<td class="type">
<span class="param-type">Array</span>
|
<span class="param-type">Iterable</span>
|
<span class="param-type">Object</span>
</td>
<td class="description last"><p>A collection to iterate over.</p></td>
</tr>
<tr>
<td class="name"><code>iteratee</code></td>
<td class="type">
<span class="param-type">function</span>
</td>
<td class="description last"><p>A truth test to apply to each item in <code>coll</code>.
The iteratee is passed a <code>callback(err, truthValue)</code> which must be called
with a boolean argument once it has completed. Invoked with (item, callback).</p></td>
</tr>
<tr>
<td class="name"><code>callback</code></td>
<td class="type">
<span class="param-type">function</span>
<span class="optional"><optional></span>
</td>
<td class="description last"><p>A callback which is called as soon as any
iteratee returns <code>true</code>, or after all the <code>iteratee</code> functions have finished.
Result will be the first item in the array that passes the truth test
(iteratee) or the value <code>undefined</code> if none passed. Invoked with
(err, result).</p></td>
</tr>
</tbody>
</table>
<h5>Example</h5>
<pre class="prettyprint"><code>async.detect(['file1','file2','file3'], function(filePath, callback) {
fs.access(filePath, function(err) {
callback(null, !err)
});
}, function(err, result) {
// result now equals the first file in the list that exists
});</code></pre>
<dl class="details">
<dt class="tag-source">Source:</dt>
<dd class="tag-source"><ul class="dummy"><li>
<a href="detect.js.html">detect.js</a>, <a href="detect.js.html#line7">line 7</a>
</li></ul></dd>
</dl>
<h4 class="name" id=".detectLimit"><span class="type-signature">(static) </span>detectLimit<span class="signature">(coll, limit, iteratee, callback<span class="signature-attributes">opt</span>)</span><span class="type-signature"></span></h4>
<div class="description">
<pre class="prettyprint source"><code>import detectLimit from 'async/detectLimit';</code></pre><p>The same as <a href="docs.html#.detect"><code>detect</code></a> but runs a maximum of <code>limit</code> async operations at a
time.</p>
</div>
<dl class="details alias-details">
<dt class="tag-alias">Alias:</dt>
<dd class="tag-alias"><ul class="dummy"><li>findLimit</li></ul></dd>
</dl>
<h5>Parameters:</h5>
<table class="params">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name"><code>coll</code></td>
<td class="type">
<span class="param-type">Array</span>
|