gistfile1.m

// tmp is an incoming array of data from the server
// nearestExits is the existing store
for (int i=0; i<[tmp count]; i++) {
  InterstateExit *incomingExit = [tmp objectAtIndex:i];
  InterstateExit *existingExit = [self.nearestExits objectAtIndex:i];
	if (![incomingExit.interstateExitID isEqualToNumber:existingExit.interstateExitID]) {
		NSIndexPath *pathToRemove = [NSIndexPath indexPathForRow:i inSection:0];
		[self.nearestExits removeObjectAtIndex:i]; // remove the item from my datasource
		[self.exitTableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:pathToRemove] withRowAnimation:UITableViewRowAnimationFade];
		[self.nearestExits insertObject:incomingExit atIndex:i]; // add the new item to the datasource
		[self.exitTableView insertRowsAtIndexPaths:[NSArray arrayWithObject:pathToRemove] withRowAnimation:UITableViewRowAnimationFade];
	}
}