neo-async
Advanced tools
Package description
The neo-async package is a utility module which provides straight-forward, powerful functions for working with asynchronous JavaScript. It is similar to the async package but with some performance improvements.
Control Flow
Execute a series of functions in sequential order. Each function is passed a callback it must call on completion.
async.series([
function(callback) {
// do some stuff ...
callback(null, 'one');
},
function(callback) {
// do some more stuff ...
callback(null, 'two');
}
],
function(err, results) {
// results is now equal to ['one', 'two']
});Collections
Apply a function to each item in a collection and collect the results.
async.map(['file1','file2','file3'], fs.stat, function(err, results) {
// results is now an array of stats for each file
});Utilities
Call a function a certain number of times and collect the results.
async.times(5, function(n, next) {
createUser(n, function(err, user) {
next(err, user);
});
}, function(err, users) {
// we should now have 5 users
});The original async package offers a wide array of functions for working with asynchronous code. Neo-async claims to offer similar functionality with improved performance.
Bluebird is a full-featured promise library with a focus on innovative features and performance. It can be used as an alternative to neo-async for handling asynchronous operations using promises instead of callbacks.
Q is a tool for making and composing asynchronous promises in JavaScript. It's an older promise library that can serve similar purposes to neo-async but with a different style of handling async operations.
Readme
Neo-Async is thought to be used as a drop-in replacement for Async, it almost fully covers its functionality and runs faster.
Async allows double callbacks in waterfall, but Neo-Async does not allow. (test)
PR is welcome ! Especially improvement for English documents :)
<script src="async.min.js"></script>
require(['async'], function(async) {});
$ npm install neo-async
var async = require('neo-async');
$ npm install neo-async
$ ln -s ./node_modules/neo-async ./node_modules/async
var async = require('async');
bower install neo-async
* not in Async
eacheachSerieseachLimitforEach -> eachforEachSeries -> eachSeriesforEachLimit -> eachLimitmapmapSeriesmapLimitmapValues *mapValuesSeries *mapValuesLimit *filterfilterSeriesfilterLimit *select -> filterselectSeries -> filterSeriesselectLimit -> filterLimit *rejectrejectSeriesrejectLimit *detectdetectSeriesdetectLimit *pick *pickSeries *pickLimit *reduceinject -> reducefoldl -> reducereduceRightfoldr -> reduceRighttransform *transformSeries *transformLimit *sortBy *sortBySeries *sortByLimit *somesomeSeries *someLimit *any -> someeveryeverySeries *everyLimit *all -> everyconcatconcatSeriesconcatLimit *parallelseriesparallelLimitwaterfallwhilstdoWhilstuntilforevercomposeseqapplyEachapplyEachSeriesqueuepriorityQueuecargoautoretryiteratorapplynextTicksetImmediatetimestimesSeriestimesLimit *Speed comparison of server-side measured by func-comparator.
Specifications are as follows.
sample.parllel.js
var comparator = require('func-comparator');
var _ = require('lodash');
var async = require('async');
var neo_async = require('neo-async');
var count = 100; // the number of parallel tasks
var times = 100000; // the number of trial times
var array = _.shuffle(_.times(count));
var tasks = _.map(array, function() {
return function(next) {
next();
};
});
// functions will be executed by random order
var funcs = {
'async': function(callback) {
async.parallel(tasks, callback);
},
'neo-async': function(callback) {
neo_async.parallel(tasks, callback);
}
};
comparator
.set(funcs)
.async()
.times(times)
.start()
.result(console.log);
execute
Execution environment are as follows.
$ gulp speed_test --file parallel
result
The value is the ratio (Neo-Async/Async) of the average speed per n times.
| function | node v0.10.38 | node v0.12.2 | iojs v1.8.1 |
|---|---|---|---|
| parallel | 5.97 | 6.44 | 6.68 |
| series | 6.99 | 7.82 | 7.66 |
| parallelLimit | 5.56 | 4.99 | 6.15 |
| waterfall | 23.38 | 33.99 | 36.93 |
| times | 4.36 | 4.22 | 4.15 |
| timesSeries | 5.05 | 4.32 | 3.72 |
| function | node v0.10.38 | node v0.12.2 | iojs v1.8.1 |
|---|---|---|---|
| each | 2.10 | 2.32 | 2.56 |
| eachSeries | 1.04 | 1.22 | 1.23 |
| eachLimit | 1.68 | 0.91 | 1.08 |
| map | 3.90 | 4.03 | 4.56 |
| mapSeries | 3.98 | 5.10 | 4.65 |
| mapLimit | 3.60 | 2.85 | 3.44 |
| filter | 3.21 | 3.12 | 3.26 |
| filterSeries | 5.29 | 7.00 | 5.58 |
| reduce | 2.05 | 1.96 | 2.49 |
| reduceRight | 3.71 | 4.01 | 4.09 |
| sortBy | 1.06 | 1.54 | 1.42 |
| some | 2.63 | 2.64 | 3.03 |
| every | 2.70 | 2.66 | 3.09 |
| concat | 3.02 | 2.34 | 2.67 |
| concatSeries | 2.56 | 2.42 | 2.65 |
FAQs
Neo-Async is a drop-in replacement for Async, it almost fully covers its functionality and runs faster
We found that neo-async demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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