How to call a function from a Class AS3 - actionscript-3

Question

I'm studying to be a Game Designer, and right now I'm having some issues with my flash game.
the game has a Counter Class, with a Score Class that extends Counter. and it is added to the stage in my PlayScreenA Class.
The Timer starts with a number and decreases every 24frames. but in my Hero Class I can pick up some coins and that coins are going to increase the Time on my Score.
The question is: How I can say in my Hero Class to execute the addToValue function inside the Counter Class?
Pieces of Code:
Creating my score in the PlayScreenA Class:
private var myTime:Score = new Score();
private function create_time (){
myTime.x = 800;
myTime.y = 50;
addChild(myTime);
}
Counter Class:
package
{
import flash.display.MovieClip;
public class Counter extends MovieClip
{
public var currentValue:Number;
public function Counter()
{
reset();
}
public function addToValue( amountToAdd:Number ):void
{
currentValue = currentValue + amountToAdd;
updateDisplay();
}
public function subToValue( amountToSub:Number ):void
{
currentValue = currentValue - amountToSub;
updateDisplay();
}
public function reset():void
{
currentValue = 20;
updateDisplay();
}
public function updateDisplay():void
{
}
}
}
Score Class:
package
{
import flash.text.TextField;
import flash.events.Event;
public class Score extends Counter
{
protected var _timeCounter:int;
public function Score()
{
super();
addEventListener(Event.ENTER_FRAME, onUpdate);
}
override public function updateDisplay():void
{
super.updateDisplay();
scoreDisplay.text = currentValue.toString();
}
protected function onUpdate(e:Event):void
{
_timeCounter++;
trace(currentValue);
if (_timeCounter == 24)
{
this.subToValue( 1 );
_timeCounter = 0;
}
}
}
}
Piece of my Hero Class where I need to Call the function:
for(var i:int; i<collisionList.length;i++)
{
var $collision:platform_tile = collisionList[i];
if($hasCollided = hitbox.hitTestObject($collision.hitBox) && $collision.alpha<0.8 && $collision.alpha>0.6)
{
$collision.alpha=0;
$collision.visible = false;
//Here is where I want to call my subToValue function!
break;
}

Answer 1

since addToValue and subToValue are instance methods, you should provide a reference (an instance variable) to the counter object in your hero object, then call its addToValue or subToValue methods.
var theCounter:Counter;
you should either initiate this in your hero object, or assign a pre-existing counter object through getter/setters. then you can call:
theCounter.addToValue();

Answer 2

I assume you are trying to access the object of Score class created initially in the PlayerScreenA class...
If that is the case then you either derive a relationship between the two classes to pass this object or you could keep a static class keeping track of the function at a global level...
public class AppRefrences
{
public static var addToValueFunc:Function;
}
In Player A Class,
private var myTime:Score = new Score();
private function create_time (){
myTime.x = 800;
myTime.y = 50;
addChild(myTime);
// This is where you set the function
Apprefrences.addToValueFunc = myTime.addToValue;
}
In Hero Class,
for(var i:int; i<collisionList.length;i++)
{
var $collision:platform_tile = collisionList[i];
if($hasCollided = hitbox.hitTestObject($collision.hitBox) && $collision.alpha<0.8 && $collision.alpha>0.6)
{
$collision.alpha=0;
$collision.visible = false;
// This is where you call the function
if(AppRefrences.addToValueFunc != null)
AppRefrences.addToValueFunc(0);
break;
}
Try using getter & setters to control the update of the static variable. I didn't include it for the sake of clarity.