array vs vector

Question

Seems like in AS3, I can in theory, delare arrays that can only contain certain data types:

private var my_array:Array.<String>;

produces this error:
1199: type parameters with a non-parameterized type

however

private var my_vector:Vector.<String>;

is just fine.

Is there a way of making this work with an Array?

I would like to declare arrays while specifying what type they are. Like an array of strings, an array numbers, etc... — Frank, Nov 07 '11 at 23:12

score 4 · Answer 1 · edited May 23 '17 at 10:34

4

Unfortunately, no.

The "Generic" syntax is a one-off that was only given to Vector. It makes me sad. I'd use generics all over the place if I could.

edited May 23 '17 at 10:34

Community

answered Nov 07 '11 at 19:56

Brian Genisio

score 4 · Accepted Answer · answered Nov 07 '11 at 23:38

4

[ArrayElementType("String")] 
public var newStringProperty:Array;

[ArrayElementType("Number")] 
public var newNumberProperty:Array;

http://livedocs.adobe.com/flex/3/html/help.html?content=metadata_3.html
unfortunately, such arrays don't provide access to methods of their element type like vectors do:

var strings:Vector.<String> = new Vector.<String>();
strings.push('hello world');
trace(strings[0].charAt(2));

answered Nov 07 '11 at 23:38

www0z0k

That metadata tag only applies to MXML array definitions. It's effectively a compile-time constraint, not a runtime enforcement. And won't do anything if used in an as class. – J. Holmes Nov 08 '11 at 00:55
it'll do nothing in a pure as3 project, it worked for me in an .as class extending `UIComponent` – www0z0k Nov 08 '11 at 07:16

score 2 · Answer 3 · answered Nov 07 '11 at 20:12

2

Arrays do not take type declarations at all at this time.

answered Nov 07 '11 at 20:12

score 0 · Answer 4 · answered Nov 07 '11 at 19:58

0

You can just pass elements of array to constructor. If you need parameterized "array", use vector.

answered Nov 07 '11 at 19:58

zaynyatyi

4 Answers4