Trying To Understand Some Code Which Uses the [i] Syntax

Question

Ok I'm trying to get a grip on using loops within flex and I found the following code somewhere which utilises a for in loop. It basically is a function that creates several labels for all of the elements in an object. One thing I cannot understand is what the [i] is used for on line 5 i.e. (myArray[i])  or more specifically what the purpose of such Square brackets in situations like these are used for. Does it refer to looking for all Strings in the array (as defined on line 3) as I assume it does? It's just pretty confusing. Can anyone point me to a guide on the syntax of square brackets and what they mean or help me out? with an explanation? Cheers.
private function createLabels():void{
var myArray:Array = ['one', "two", 3];
for(var i:String in myArray){
var myLabel:Label = new Label();
myLabel.text = (myArray[i]);
myBox.addChild(myLabel);

Answer 1

You've probably already seen these, but here are a couple of links that may help.
http://help.adobe.com/en_US/FlashPlatform//reference/actionscript/3/operators.html#array_a ccess
http://www.adobe.com/livedocs/flash/9.0/ActionScriptLangRefV3/Array.html
What's basically happening is that the "for" loop goes through each item in the array.  Don't be confused by the fact that two of the items in the array are Strings and one is an Integer - variable i being a String has nothing to do with the data type of the elements in the array.
The following code:
private function createLabels():void
     var myArray:Array = ['one', 'two', 3];
     for(var i:String in myArray)
          trace("i = " + i);
          trace(myArray[i]);
gives the following results:
i = 0
one
i = 1
two
i = 2
3
From that we can see that the "for" loop is assigning the index number of each array element, not the actual array element ('one', 'two', or 3) to the variable i.  So calling myArray[i] is the same as calling myArray[0] the first time through the loop.  This type of "for" loop is just a shorter way of doing the following, which produces exactly the same results:
private function createLabels():void
     var myArray:Array = ['one', 'two', 3];
     for(var i:int = 0; n < myArray.length; i++)
          trace("i = " + i);
          trace(myArray[i]);
Hope that helps.
Cheers!