The document discusses arrays in ActionScript 3.0. Arrays can store multiple variables or objects in a single variable. Data can be retrieved from arrays using index numbers. Arrays can also store objects. For loops allow repeating operations on array elements. Random numbers can be used to randomize array element properties like location and velocity. Functions like push() and slice() modify arrays. The homework is to complete a Flash Memory Game tutorial using arrays.

2. Arrays

14. Script package { import flash.display.*; import flash.events.*; public class MyAnimation extends MovieClip { // Setup the values private var bounce:Number = -0.9; private var gravity:Number = .5; private var oldX:Number; private var oldY:Number; private var N:uint = 3; private var ballArray:Array = new Array(); //Constructor public function MyAnimation() { init(); } //Methods public function init():void { for (var i:uint = 0; i < N; i++){ var thisBall:Ball = new Ball(); ballArray.push(thisBall); ballArray[i].graphics.lineStyle(5,0x000000); ballArray[i].graphics.beginFill(0xCCCCCC); ballArray[i].graphics.drawCircle(0,0,25); ballArray[i].x = Math.floor(Math.random()*500); ballArray[i].y = Math.floor(Math.random()*400); ballArray[i].moveX = Math.floor(Math.random()*20); ballArray[i].moveY = Math.floor(Math.random()*20); addChild(ballArray[i]); } addEventListener(Event.ENTER_FRAME, onMoveCircle); } public function onMoveCircle(pEvent:Event):void { for (var i:int = 0; i < ballArray.length; i++){ ballArray[i].moveY = ballArray[i].moveY + gravity; ballArray[i].x = ballArray[i].x + ballArray[i].moveX; ballArray[i].y = ballArray[i].y + ballArray[i].moveY; if(ballArray[i].x > stage.stageWidth - ballArray[i].width/2 || ballArray[i].x < ballArray[i].width/2) { ballArray[i].moveX = ballArray[i].moveX*bounce; //change direction } if(ballArray[i].y > stage.stageHeight - ballArray[i].height/2 || ballArray[i].y < ballArray[i].height/2) { ballArray[i].moveY = ballArray[i].moveY*bounce; //change direction } } } } }