Errors on [indexPath!] and [newIndexPath!] - the message "Cannot convert value of type 'NSIndexPath?' to expected element type 'IndexPath'

Question

// Errors on [indexPath!] and [newIndexPath!] ---- the message "Cannot convert value of type 'NSIndexPath?' to expected element type 'Array<IndexPath>.ArrayLiteralElement' (aka 'IndexPath')" 

func controller(controller:   
    NSFetchedResultsController<NSFetchRequestResult>, didChangeObject
    anObject: AnyObject, atIndexPath indexPath: NSIndexPath?, 
    forChangeType type: NSFetchedResultsChangeType, newIndexPath: 
                                                      NSIndexPath?) {

    switch(type) {
      case .insert:
          self.heroTableView.insertRowsAtIndexPaths([newIndexPath!],  
                                            withRowAnimation: .fade)
      case .delete:
          self.heroTableView.deleteRowsAtIndexPaths([indexPath!],     
                                            withRowAnimation: .fade) 
      default:
          ()
   }
}

Answer 1

// Thank you, Willeke. // I post this for those who will meet the same errors. func controller(controller:
NSFetchedResultsController, didChangeObject anObject: AnyObject, atIndexPath indexPath: IndexPath?, forChangeType type: NSFetchedResultsChangeType, newIndexPath: IndexPath?) {

switch(type) {
  case .insert:
      self.heroTableView.insertRows(at: [newIndexPath!], with: .fade)
                                                        
  case .delete:
      self.heroTableView.deleteRows(at: [indexPath!], with: .fade)    
                                                      
  default:
      ()

} }