Move Coins downard in Array AS3 - arrays

Question

I'm trying to make an array that creates 4 coins (which I've done), but the problem is I'm trying to move the coins downward, and I can't figure out how to access the array list to move the coins down(commented out lenght[i].y +=4) which doesn't work. The other problem is I want to only create 4 coins, and not 4 coins every frame in the update loop.
Thanks.
public class Coin extends Sprite
{
//..SPRITES
public static var coinSprite:CoinSprite;
public var _coins:Array = new Array();
public var c = new CoinSprite();
public static var COINCOUNT:int = 4;
//-------------------------------------------------------------------------|
//##SETUP------------------------------------------------------------------|
//-------------------------------------------------------------------------|
public function Coin()
{
super();
this.addEventListener(starling.events.Event.ADDED_TO_STAGE, stageSetup);
}
public function stageSetup(event:Event):void {
this.removeEventListener(Event.ADDED_TO_STAGE, stageSetup);
}
//-------------------------------------------------------------------------|
//-------------------------------------------------------------------------|
//##MANAGER----------------------------------------------------------------|
//-------------------------------------------------------------------------|
public function manager():void {
this.addEventListener(Event.ENTER_FRAME, updateCoin);
}
//-------------------------------------------------------------------------|
//-------------------------------------------------------------------------|
//##COINHANDLER------------------------------------------------------------|
//-------------------------------------------------------------------------|
public function coinHandler():void {
var length:Number = 4;
for ( var i:Number = 0; i < length; i++) {
//length[i].y += 4;
createCoin();
c.y = i * 50;
}
}
//-------------------------------------------------------------------------|
//-------------------------------------------------------------------------|
//##COLLISION||------------------------------------------------------------|
//-------------------------------------------------------------------------|
public function hitCoinPlayer():void {
//..cleanup
if (c.hitTestObject(Player.playerSprite)) {
c.alpha = 0;
}
//..check bounds
if (c.y >= 1500) {
c.y = -200;
c.alpha = 1;
}
}
//-------------------------------------------------------------------------|
//-------------------------------------------------------------------------|
//##UPDATE-----------------------------------------------------------------|
//-------------------------------------------------------------------------|
public function updateCoin(e:Event):void {
//coinHandler();
}
//-------------------------------------------------------------------------|
//-------------------------------------------------------------------------|
//##CREATE COIN------------------------------------------------------------|
//-------------------------------------------------------------------------|
public function createCoin():void {
c = new CoinSprite();
c.x = 305;
Starling.current.nativeOverlay.addChild(c);
_coins.push(c);
}
//-------------------------------------------------------------------------|
}

Answer 1

public var _coins:Array = {}; // you need an array to store the coins you've created
public function stageSetup(event:Event):void {
coinHandler(); //create four coins upon setting up the stage
this.removeEventListener(Event.ADDED_TO_STAGE, stageSetup); //done setup
}
//other parts of the code are not changed
public function coinHandler():void { // you only need to call this once from ur stagesetup
var length:Number = 4;
for ( var i:Number = 0; i < length; i++) {
createCoin();
c.y = i * 50;
}
}
public function updateCoin(e:Event):void {
moveCoin();
}
public function moveCoin(){
for ( var i:Number = 0; i < _coins.length; i++) {
_coins[i].y +=4;
}
}
public function createCoin():void {
c = new CoinSprite();
c.x = 305;
Starling.current.nativeOverlay.addChild(c);
_coins.push(c);
}