Ajax function on jQuery 1.8 style by CoffeeScript

ajax_func.coffee

ajax_req = (param, beforeReq, doneReq, afterReq) ->
  beforeReq = null if typeof beforeReq == 'undefined'
  doneReq = null if typeof doneReq == 'undefined'
  afterReq = null if typeof afterReq == 'undefined'
  
  $.ajax 'http://www.example.com/blah',
    type:'GET'
    dataType:'json'
    beforeSend: (jqXHR, settings) ->
      console.log settings
      beforeReq(settings)
  .fail (jqXHR, textStatus, errorThrown) ->
    console.log errorThrown
  .done (data, textStatus, jqXHR) ->
    console.log data
    doneReq(data)
  .always (data, textStatus, jqXHR) ->
    console.log textStatus
    afterReq(textStatus)