foreachasync

forEachAsync.js
===

| A Root project

Analogous to [].forEach, but handles items asynchronously with a final callback passed to then.

This is the most essential piece of the ArrayAsync package.

For cases where you want to loop through batches of items at once (as opposed to strictly one-by-one as forEachAsync does), check out forAllAsync and lateral.

For cases where you want to loop through all items at once and we able to know when they're all done see join

v5.x
----

We jumped from 3.x to 5.x because I'm considering creating a backwards-and-forwards compatible 4.x that
uses AngularJS-style function introspection to allow for having the next param.
Straight up, that's probably a bad idea and waste of time so I hope I don't actually do it.

Screencast
---

Usage
-----

``javascript
// EXAMPLE ASYNC FUNCTION

function getPicsAsync(animal) {
var flickerApi = "http://api.flickr.com/services/feeds/photos_public.gne?tagmode=any&format=json&tags=" + animal;

return requestAsync({ url: flickerApi });
}
`

`javascript
forEachAsync(['dogs', 'cats', 'octocats'], function (element) {
return getPicsAsync(element);
}).then(function () {
// then after all of the elements have been handled
// the final callback fires to let you know it's all done
console.log('All requests have finished');
});
`

$3

If native ES6 promises are not available, then you should supply your own Promises/A+
implementation like so:

`javascript
forEachAsync = forEachAsync.create(window.Promise || require('bluebird'));
`

Browser Installation
===

You can install from bower:

`bash
bower install --save forEachAsync@5.x
`

Or download the raw file from :

`bash
wget https://git.coolaj86.com/coolaj86/foreachasync.js/raw/branch/master/foreachasync.js
`

`javascript
(function () {
'use strict';

var forEachAsync = window.forEachAsync;

// do stuff ...
}());
`

Note: If you need both 3.x/4.x and 5.x version of forEachAsync in the browser... good luck with that...

Node Installation
===

`bash
npm install --save foreachasync@5.x
`

API
===

forEachAsync(array, callback[, thisArg])

Parameters

* array Array of elements to iterate over
* callback Function to execute for each element, takes 4 arguments
* element a single element of the aforementioned array
* index the index of the current element
* array the same array mentioned above
* thisArg Object to use as this when executing callback

forEachAsync#then(done)

Parameters

* then is in the return value of forEachAsync and accepts a final done callback.
* done called after forEachAsync is complete, takes no arguments

Internal API
===

forEachAsync.__BREAK

This is used internally for the purposes of the ArrayAsync library.

Please don't break stuff; use ArrayAsync.someAsync or ArrayAsync.everyAsync` instead.