Different ways of calling functions with call-backs (i.e. multiple parameters that are functions) in CoffeeScript.

Callbacks.coffee

# Separate functions
success = (data, status, header) ->
    promise.resolve data.user
error = (data, status, header) ->
    promise.reject data.error
user = getUserById id, success, error


# Comma in front of each function
user = getUserById id
  , (data, status, header) ->
    promise.resolve data.user
  , (data, status, header) ->
    promise.reject data.error


# One comma after value parameter
user = getUserById id,
  (data, status, header) ->
    promise.resolve data.user
  (data, status, header) ->
    promise.reject data.error