Sequencer in coffeescript

sequencer.coffee

sequence = (arr) ->
  self = ->
    if arr.length then arr.shift() self
  self()

async = (callback) ->
  console.log "Calling callback after 1s"
  setTimeout callback, 1000 

sequence [async, async, async]

Functions can be inlined as follows,

    async = (callback) ->
      setTimeout () ->
          console.log "Calling callback after 1s"
          callback()
        , 1000 

See https://github.com/michiel/sequencer-js for some background.