Comments on: VBScript Array Length

By: Alex

Alex — Mon, 15 Mar 2010 14:14:18 +0000

@Amar
Not so. The Preserve keyword on the ReDim keeps all the existing data in the array intact. Although if memory serves me correctly the syntax is with Preserve directly following the ReDim statement.

ReDim Preserve DynamicArray(10)

@0xG
Another way I found of getting around the error generated is to ReDim your dynamic array right after declaring it. That then gives you a ubound to work with from the start.

Dim Dynamic()
ReDim Dynamic(0)

WScript.Echo â€œArray size is â€ & UBound(Dynamic)

You can then go on to do your other processing too as per the example in LAYGO’s loop.

By: Amar

Amar — Sat, 09 Jan 2010 01:37:28 +0000

Problem in above solution is, every time when Array is redimed previous value will be get flushed out, so only last value will be stored

By: LAYGO

LAYGO — Wed, 09 Dec 2009 16:10:15 +0000

Frederic is right.

If you want a true dynamic array:

Dim DynamicArray()

For x = 0 To n
ReDim DynamicArray(x) Preserve
‘ some processing here
DynamicArray(x) = “results of some processing here”
Next

By: chaitanya

chaitanya — Mon, 13 Apr 2009 09:59:58 +0000

Size means bytelength of content

By: chaitanya

chaitanya — Mon, 13 Apr 2009 09:44:44 +0000

Hi every one,

I need to find the number of bytes occupied by a array variable.Can any one help me please.

By: Frederic Duplessis

Frederic Duplessis — Thu, 19 Mar 2009 21:01:03 +0000

Dynamic arrays can NOT be defined as “dummy” was suggesting Dim dynamic (0).

In VBScript, the subscript in Dim statement really is what will be returned via UBound function, which is namely the highest subscript one may use to refer to an element in the array and NOT the size of it. Thus this statement Dim dynamic (0) would really create an fixed-size, non-dynamic, array variable containing one element accessible with subscript 0.

Dave’s solution seems the only avenue here.

By: Mike Irving

Mike Irving — Thu, 26 Feb 2009 17:02:31 +0000

The loop counter is very useful, shame there is now built in loop property.

By: dummy

dummy — Mon, 27 Oct 2008 11:08:28 +0000

Give your dynamic array a size of 0:

Dim Dynamic(0)

Then it won’t error because it will have a length.

By: 0xG

0xG — Wed, 10 Sep 2008 14:49:29 +0000

What is even more perplexing is how to determine number if elements in a dynamic array. For instance:

Dim Dynamic()
WScript.Echo “Array size is ” & UBound(Dynamic)

>Microsoft VBScript runtime error: Subscript out of range

By: Dave S

Dave S — Thu, 07 Feb 2008 19:03:59 +0000

You could always create a counter, loop thru the array & increment as you go. It may be ugly but it works

Dim counter
For Each x in myArray
counter = counter + 1
Next