forEach 
  fun forEach(callbackfn: (item: DataTransferItem, mimeType: String, dataTransfer: DataTransfer) -> Unit, thisArg: JsAny? = definedExternally)(source)
Allows iteration through the data transfer items.
Parameters
callbackfn
Callback for iteration through the data transfer items.
thisArg 
The this context used when invoking the handler function.