As3 - Script Error on Arrays - actionscript-3

Question

please inspect me coding:
function createRandomList():void
{
var newlist:Array = [0,1,2];
var curlist:Array = item[selectedlevel - 1] //selectedlevel = 1;
var normal:int = curlist[0];
var tempboo1:Boolean = false;
var tempboo2:Boolean = false;
var tempboo3:Boolean = false;
while (curlist[0] + curlist[1] + curlist[2] > 0)
{
if (Number(curlist[0]) == 0 && tempboo1 == false)
{
newlist.splice(newlist.indexOf(0), 1);
tempboo1 = true;
}
if (Number(curlist[1]) == 0 && tempboo2 == false)
{
newlist.splice(newlist.indexOf(1), 1);
tempboo2 = true;
}
if (Number(curlist[2]) == 0 && tempboo3 == false)
{
newlist.splice(newlist.indexOf(2), 1);
tempboo3 = true;
}
var temp:int = Math.floor(Math.random()*(newlist.length));
curlist[temp] -= 1;
generatedlist.push(Number(newlist[temp]));
trace(item);
}
while (normal > 0)
{
var temp2:int = Math.floor(Math.random() * 3) + 1;
generatednormal.push(Number(temp2));
normal--;
}
}
My item was [[5,0,0],[10,0,0]];
But after became [[0,0,0],[0,0,0]];
I just want to duplicate Array item to be a new variable curlist.
Every time it traces, returning item[0][0] decreasing 1, I only want to use curlist as a temp Array to calculate a new random Array based on item[0].
Ouput:
4,0,0,10,0,0
3,0,0,10,0,0
2,0,0,10,0,0
1,0,0,10,0,0
0,0,0,10,0,0
Is there any links between them, or is it my problem? Please help! If you need any more infoemation, please comment me!

Answer 1

Arrays are passed by reference, not value. That means when you modify an array through any property that points to it, the original array will be modified.
To make a duplicate, you can use .slice()
Returns a new array that consists of a range of elements from the original array, without modifying the original array. The returned array includes the startIndex element and all elements up to, but not including, the endIndex element.
If you don't pass any parameters, the new array is a duplicate (shallow clone) of the original array.

Answer 2

You can clone your arrays if you want to create a new reference.
function clone( source:Object ):*
{
var myBA:ByteArray = new ByteArray();
myBA.writeObject( source );
myBA.position = 0;
return( myBA.readObject() );
}
var a:Array = [[0,0],[1,1]];
var b:Array = clone(a);
b[0] = [2,2];
trace(a)
trace(b)
Output
0,0,1,1
2,2,1,1
It works for any object, not only arrays.
More infos here : AS3 - Clone an object

Answer 3

var array : Array = [ 1, 2, 3];
var array2 : Array = array.concnt();
array[ 0 ] = 4;
trace( array );// 1, 2, 3
trace( array 2);// 4, 2 ,3
So use .concat() to duplicate an array with primitives. If you have an arrays with arrays. Duplicate the children arrays, and put them into an empty one. If you have children of children arrays and so forth, make something recursive.