$private Modifier on Instance Members

∟$private Modifier on Instance Members

This section describes the $private modifier on Instance members (variables and functions).

If you want to stop everyone accessing an instance member (a property or a method) from outside the instance definition body, you can use the $private modifier to declare it to be privately accessible only.

Examples of using $private modifier on instance members:

$class account: {
   $private currency = "USD";
   $insance x: {
      $private x.balance = 0.0;
      $private $method x.updateBalance(change): {
	     x.balance = x.balance + change;
	  }
	  $public $method x.deposit(amount): {
         x.upateBalance(amount); 
      };
	  $public $method x.withdraw(amount): {
         x.upateBalance(-amount); 
      };
	  $public $method x.printBalance(): {
         write(x.balance); 
      };
   }
}

checking = account();
checking.deposit(100.0);
checking.deposit(80.0);

checking.updateBalance(10.0); # gets MethodNotFound error