Q Promises

gistfile1.txt

Q = require 'q'

init = () ->
  console.log 'init'
  promises = [checkS3FolderExists('MyData1'), checkS3FolderExists('MyData2')]

  Q.all(promises).then (results)->
    console.log 'Done!'
    console.log results

  console.log 'init complete'


checkS3FolderExists = (folder) ->
  console.log "checking for folder #{folder}"

  params =
    folder: folder
  s3Request('listObjects', params)


s3Request = (task, params) ->
  deferred = Q.defer()
  setTimeout ->
    deferred.resolve("Found folder: #{params.folder}")
  , 1000
  deferred.promise

init()

###
Generated output:

init
checking for folder MyData1
checking for folder MyData2
init complete
Done!
[ 'Found folder: MyData1', 'Found folder: MyData2' ]
###