How to declare a filled Vector?

Question

I am using Vectors in Flash 10 for the first time, and I want to create it in the same way I used to do with Arrays, e.g:

var urlList : Array = [url1, url2, url3];

I have tried various different methods but none seem to work, and I have settled on the following as a solution:

var urlList : Vector.<String> = new Vector.<String>();
urlList.push(url1, url2, url3);

Is this even possible?

score 22 · Accepted Answer · answered May 27 '11 at 20:48

22

When it doubt, check the AS3 docs. :)

var urlList : Vector.<String> = new <String>["str1", "str2", "str3"];
trace(urlList);

Direct quote of the line I adapted this from in the documentation:

To create a pre-populated Vector instance, use the following syntax instead of using the parameters specified below:

 // var v:Vector.<T> = new <T>[E0, ..., En-1 ,];
 // For example: 
 var v:Vector.<int> = new <int>[0,1,2,];

answered May 27 '11 at 20:48

This works correctly, although I'm using FDT and it breaks a bunch of formatting :S Strange - maybe it's time for a new question! – soulBit May 27 '11 at 21:01
Interesting syntax. +1 since you get compile time type checking. – Sean Fujiwara May 27 '11 at 21:04
This didn't work for me, and then I realized it's because I'm using Flash CS4. I was wondering why I wasn't familiar with this syntax. :P – Kyle Delaney Apr 05 '17 at 15:58

score 6 · Answer 2 · answered May 27 '11 at 20:54

6

You coerce an array to a Vector:

var urlList:Vector.<String> = Vector.<String>([url1, url2, url3]);

answered May 27 '11 at 20:54

Sean Fujiwara

If I do this my build fails :( – soulBit May 27 '11 at 20:58
@soulBit With what compiler? This has been supported since vectors were introduced as far as I know. – Sean Fujiwara May 27 '11 at 21:05
Actually soulBit it turns out this does work, so it does at least deserve an upvote. :) – May 27 '11 at 21:11
1

Actually I wouldn't use this method, because it's proven to be slower than the version provided by @Digital Architect 100 000 pre populated vectors with this method took over 800ms, the other version a little over 500 ms – Creative Magic Dec 18 '13 at 03:23
Makes sense that it's slower. Why would you perform a type coercion from Array to Vector just to define a vector? The correct answer is the other one, as defined in Adobe's documentation: new [...]; – OMA Nov 15 '16 at 14:46

2 Answers2