npm install reduce-asyncReduceAsync 
===========
Asynchronous Array.reduce. The [reduce()][external_mdn_reduce] method applies a function against an accumulator and each value of the array (from left-to-right) to reduce it to a single value.
*
``bash`
$ npm install reduce-async
`
reduceAsync(array, iteratee, done[, initialValue])
Parameters
array Array* - The array to reduce.
iteratee Function* - The function to execute on each value in the array, taking five arguments:
prev Any* - The value previously returned in the last invocation of the iteratee, or initialValue if supplied.
curr Any* - The current element being processed in the array.
n Integer* - The index of the current element being processed in the array. Start at index 0, if an initialValue is provided, and at index 1 otherwise.
arr Array* - The array reduceAsync was called upon.
next Function* - The function to call when you are ready to advance to the next element in the array.
done Function* - The function called when the reduce has finished, taking one argument:
result Any* - The value that results from the reduction.
initialValue Any* (Optional) - Value to use as the first argument to the first call of the iteratee.
[More information][external_mdn_reduce] on how reduce works.
* Asynchronously sum all the values of an array.
`js`
reduceAsync([0, 1, 2, 3], (prev, curr, n, arr, next) => {
doSomethingAsync(() => {
next(prev + curr);
});
}, result => {
// result == 6
}));
* Asynchronously flatten an array of arrays,
`js`
reduceAsync([[0, 1], [2, 3], [4, 5]], (prev, curr, n, arr, next) => {
doSomethingAsync(() => {
next(prev.concat(curr));
});
}, result => {
// result is [0, 1, 2, 3, 4, 5]
}));
* Asynchronously concatenate all words within an array together starting from an initial value of "foo".
`js``
reduceAsync(['bar', 'baz']], (prev, curr, n, arr, next) => {
doSomethingAsync(() => {
next(prev + curr);
});
}, result => {
// result is "foobarbaz"
}, 'foo'));
*
Authors
-------
* [Nathan Buchar]
License
-------
ISC
[external_mdn_reduce]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/Reduce
[Nathan Buchar]: mailto:hello@nathanbuchar.com