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async2

v0.1.9

Published

Better async utilities for node and the browser

Downloads

18

Readme

Async2.js

Better asynchronous javascript flow control in 132 lines (5.7KB) or 4KB minified or 1285 bytes gzipped.

Inspired by async, mini-async, Mocha, Chai, Should.js, and IcedCoffeeScript/TameJs libraries.

Flow Control

Quick Examples

First, reflect upon our haiku mantra:

5  thoughtful single-chain
7  order of operations
5  escape callback hell!

Then, observe in action:

Partially backward-compatible with async.js:

async.series [
 -> async.delay 100, @
 -> async.delay 50, @
], ->
  assert.closeTo 100+50, since(start), 25

  async.parallel [
   -> async.delay 100, @
   -> async.delay 50, @
  ], ->
    assert.closeTo (100+50)+100, since(start), 25
    done()

But better thanks to several improvements:

async
  .serial((next) ->
    assert.typeOf next, 'function'
    next null, 'async data' # e.g., fs.readFile(), or jQuery.ajax()
  )
  .parallel((data, next) ->
    assert.equal data, 'async data'
    assert.typeOf next, 'function'
    next null
  )
  .parallel((data, next) ->
    assert.equal data, 'async data'
    assert.typeOf next, 'function'
    next null
  )
  .serial(->
    assert.typeOf @, 'function' # `this` === `next`
    @ null, 1, 2, 3, 4, 5, 6
  )
  .end (err, results...) ->
    assert.equal err, null
    assert.deepEqual results, [ 1, 2, 3, 4, 5, 6 ]
    done()

In fact, way better:

flow = new async
for i in [1..10]
  ((i) ->
    method = if i%3 then 'parallel' else 'serial' # an overcomplicated display of flexibility
    flow[method] (next) ->
      async.delay 25, ->
        console.log "#{method} #{i}"
        next()
  )(i)
flow.go (err, results...) ->
  console.log 'try this in async.js!'
  done()

It really makes you wonder: how long have we needed a good asynchronous flow control library, and not known it?

Exhibit A: Look familiar to any jQuery.ajax() developers?

called = false
async
  before: ->
    #loading.show()
    called = true
  do: (next) ->
    # main logic
    assert.ok called
    next 'err', 'result'
  error: (err) ->
    assert.equal 'err', 'err'
    #alert err
  success: (result) ->
    assert false, 'success() should not have been called here'
    #console.log data
  complete: (err, result) ->
    assert.equal err, 'err'
    assert.equal result, 'result'
    #loading.hide()
    done()

Exhibit B: How about to you JavaScript developers?

called = false
async
  .try(->
    @ new Error 'thrown node cb style'
  )
  .catch((err) ->
    called = true
    assert.equal ''+err, 'Error: thrown node cb style'
  )
  .finally (err, result) ->
    assert.ok called
    assert.equal ''+err, 'Error: thrown node cb style'
    assert.typeOf result, 'undefined'
    done()

Exhibit C: Any Rubists in the audience?

called = false
async
  .begin(->
    @ new Error 'thrown node cb style'
  )
  .rescue((err) ->
    called = true
    assert.equal ''+err, 'Error: thrown node cb style'
  )
  .else((result) ->
    console.log 'Else'
    assert false, 'else() should not have been called here'
  )
  .ensure (err, result) ->
    assert.ok called
    assert.equal ''+err, 'Error: thrown node cb style'
    assert.typeOf result, 'undefined'
    done()

Additionally, nextTick() users will appreciate the lazy man's grouped blocking serial execution:

async.push 'A', (next) ->
  setTimeout (-> console.log 'second'; next()), 100
async.push 'B', (next) ->
  setTimeout (-> console.log 'first'; next()), 10
async.push 'A', (next) ->
  setTimeout (-> console.log 'third'; next()), 1
# outputs:
# first
# second
# third

These are just a few of all the things it can do.

For the latest examples, review the easy-to-follow ./test/test.coffee.

Or try it immediately in your browser with codepen.

FAQ

  • great another high horsed coffeescripter! i just prefer to author in coffee. the .js and .js.min versions are in here too. you can do all the same things; in fact it is partially backward-compatible with async.js but in less lines of .js less bytes i should say; its a minimalist implementation with some improvements.

  • have you tried pull requests to the async repo? i may if i get positive response but its 100% refactor from ground-up; its not just a pull request. also any snide remarks are meant to encourage spirited but constructive debate. i'm not trying to be divisive. just had a need with a short timeline :) i know a lot of people get used to the way things are...

TODO

  • i could name variables better to assist with minification but its already pretty small. i may do it later though.

  • potential node.js madness: each series becomes its own cpu thread, each parallel becomes its own gpu thread.

"GPUs have evolved to the point where many real-world applications are easily implemented on them and run significantly faster than on multi-core systems. Future computing architectures will be hybrid systems with parallel-core GPUs working in tandem with multi-core CPUs.' -- Professor Jack Dongarra, Director of the Innovative Computing Laboratory, The University of Tennessee