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<h1 class="page-title">Global</h1>
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<h3 class="subsection-title">Type Definitions</h3>
<h4 class="name" id="AsyncFunction"><span class="type-signature"></span>AsyncFunction<span class="signature">()</span><span class="type-signature"></span></h4>
<div class="description">
<p>An "async function" in the context of Async is an asynchronous function with
a variable number of parameters, with the final parameter being a callback.
(<code>function (arg1, arg2, ..., callback) {}</code>)
The final callback is of the form <code>callback(err, results...)</code>, which must be
called once the function is completed. The callback should be called with a
Error as its first argument to signal that an error occurred.
Otherwise, if no error occurred, it should be called with <code>null</code> as the first
argument, and any additional <code>result</code> arguments that may apply, to signal
successful completion.
The callback must be called exactly once, ideally on a later tick of the
JavaScript event loop.</p>
<p>This type of function is also referred to as a "Node-style async function",
or a "continuation passing-style function" (CPS). Most of the methods of this
library are themselves CPS/Node-style async functions, or functions that
return CPS/Node-style async functions.</p>
<p>Wherever we accept a Node-style async function, we also directly accept an
<a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/async_function">ES2017 <code>async</code> function</a>.
In this case, the <code>async</code> function will not be passed a final callback
argument, and any thrown error will be used as the <code>err</code> argument of the
implicit callback, and the return value will be used as the <code>result</code> value.
(i.e. a <code>rejected</code> of the returned Promise becomes the <code>err</code> callback
argument, and a <code>resolved</code> value becomes the <code>result</code>.)</p>
<p>Note, due to JavaScript limitations, we can only detect native <code>async</code>
functions and not transpilied implementations.
Your environment must have <code>async</code>/<code>await</code> support for this to work.
(e.g. Node > v7.6, or a recent version of a modern browser).
If you are using <code>async</code> functions through a transpiler (e.g. Babel), you
must still wrap the function with <a href="docs.html#asyncify">asyncify</a>,
because the <code>async function</code> will be compiled to an ordinary function that
returns a promise.</p>
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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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