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<h1 class="page-title">tryEach.js</h1>
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<pre class="prettyprint source linenums"><code>import noop from 'lodash/noop';
import eachSeries from './eachSeries';
import wrapAsync from './internal/wrapAsync';
import slice from './internal/slice';
/**
* It runs each task in series but stops whenever any of the functions were
* successful. If one of the tasks were successful, the `callback` will be
* passed the result of the successful task. If all tasks fail, the callback
* will be passed the error and result (if any) of the final attempt.
*
* @name tryEach
* @static
* @memberOf module:ControlFlow
* @method
* @category Control Flow
* @param {Array|Iterable|Object} tasks - A collection containing functions to
* run, each function is passed a `callback(err, result)` it must call on
* completion with an error `err` (which can be `null`) and an optional `result`
* value.
* @param {Function} [callback] - An optional callback which is called when one
* of the tasks has succeeded, or all have failed. It receives the `err` and
* `result` arguments of the last attempt at completing the `task`. Invoked with
* (err, results).
* @example
* async.tryEach([
* function getDataFromFirstWebsite(callback) {
* // Try getting the data from the first website
* callback(err, data);
* },
* function getDataFromSecondWebsite(callback) {
* // First website failed,
* // Try getting the data from the backup website
* callback(err, data);
* }
* ],
* // optional callback
* function(err, results) {
* Now do something with the data.
* });
*
*/
export default function tryEach(tasks, callback) {
var error = null;
var result;
callback = callback || noop;
eachSeries(tasks, function(task, callback) {
wrapAsync(task)(function (err, res/*, ...args*/) {
if (arguments.length > 2) {
result = slice(arguments, 1);
} else {
result = res;
}
error = err;
callback(!err);
});
}, function () {
callback(error, result);
});
}
</code></pre>
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Documentation has been modified from the original. For more information, please see the <a href="https://github.com/caolan/async">async</a> repository.</footer></div>
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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" 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