_first() Method - Object Initialization

∟_first() Method - Object Initialization

This section describes the _first() method for object initialization.

The _first() method is for object initialization during the new object construction process. To write the _first() method, you need to follow these rules:

The _first() method is located in the $instance definition body.
You can use object properties in the _first() method, since the property statements will be executed before executing _first().
Argument data objects received in the __new() call will be passed to the argument list of the _first() method.
No need to return any data object from the _first() method.
The _first() will be called only by the H system.

Example of specifying the _first() method:

$class user: {
   $instance x: {
      x.login;
      x.password;
      $method x._first(l="guest", p="DontTell"): {
         x.login = l;
		 x.password = p;
      };
      $method x.changePassword(newPassword): {
         x.password = newPassword;
      }
      $method x.showPassword(): {
	     write(x.password);
      }
   }
}

u = user(); # _first() is called with default arguments

u = user("herong"); # _first() is called with a positioned argument

u = user(p="******"); # _first() is called with named argument