async vs step

async.coffee

async.series [
  (done) -> fs.writeFile '/tmp/test', 'yay', ->
    console.log 'yay!!'
    done null
  (done) ->
    console.log 'hello'
    done null
  -> console.log 'world'
]

step.coffee

step(
  -> fs.writeFile '/tmp/test', 'yay', @
  ->
    console.log 'yay!!'
    @
  ->
    console.log 'hello'
    @
  -> console.log 'world'
)

writeFile = (done) -> fs.writeFile '/tmp/test', 'yay', ->
console.log 'yay!!'
done null
logMessage = (done) ->
console.log 'hello'
done null
anotherMessage = -> console.log 'world'

async.series [writeFile, logMessage, anotherMessage]