     if as_array?
       @_get("characters").insertContents position, as_array
 
-  deleteHelper : (position, length = 1) ->
+  deleteHelper= (position, length = 1) =>
     console.log "deleteHelper"
     (@_get "characters").delete position, length
 

  # @param position [Integer] start position for the delta, default: 0
  #
  # @return [Integer] the position of the cursor after parsing the delta
  deltaHelper : (delta, position = 0) ->
    if delta?
      selections = (@_get "selections")
      delta_unselections = []

        return position + retain
      throw new Error "This part of code must not be reached!"

  insertHelper= (position, content) =>
    as_array =
      if typeof content == "string"
        content.split("")
