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All Forums >> [Scripting] >> WSH & Client Side VBScript >> Determining Array length
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Determining Array length - 11/11/2006 10:13:13 PM

TNO

Posts: 1399
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Joined: 12/18/2004
From: thenewobjective.com
Status: online

Unlike JScript, there is apparently no direct method of obtaining the length of an Array. So my question is, has anyone come up with a creative way of determining the length of an array in VBScript?

This is what I could come up with:

Is there a better way?

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To iterate is human, to recurse divine. -- L. Peter Deutsch

Post #: 1

RE: Determining Array length - 11/12/2006 1:42:45 AM

ehvbs

Posts: 2222
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Joined: 6/22/2005
From: Germany
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Hi TNO,

use UBound() in VBScript where you would use .length in Javascript, but remember,
that UBound() returns the last index:

Dim a1D : a1D = Array( 10, 20, 30, 40, 50, 60, 70, 80, 90 )
Dim a2D( 1, 2 )
a2D( 0, 0 ) = "00"
a2D( 0, 1 ) = "01"
a2D( 0, 2 ) = "02"
a2D( 1, 0 ) = "10"
a2D( 1, 1 ) = "11"
a2D( 1, 2 ) = "12"
WScript.Echo "LBound( a1D ) =", LBound( a1D ), "UBound( a1D ) =", UBound( a1D )
WScript.Echo "UBound( a2D ) =", UBound( a2D )
WScript.Echo "UBound( a2D, 1 ) =", UBound( a2D, 1 )
WScript.Echo "UBound( a2D, 2 ) =", UBound( a2D, 2 )

(in reply to TNO)

Post #: 2

RE: Determining Array length - 11/12/2006 2:13:13 AM

TNO

Posts: 1399
Score: 16
Joined: 12/18/2004
From: thenewobjective.com
Status: online

Thanks for the reply. I considered this method but is not quite as foolproof as I'd like, for example:

This doesn't account for undefined variables and alerts 10 instead of 1.There is no doubt a workaround using ReDim for this but I was hoping for something simpler

_____________________________

To iterate is human, to recurse divine. -- L. Peter Deutsch

(in reply to ehvbs)

Post #: 3

RE: Determining Array length - 11/12/2006 2:20:17 AM

TNO

Posts: 1399
Score: 16
Joined: 12/18/2004
From: thenewobjective.com
Status: online

Belated thought:
I'm apparently thinking of VBScript arrays in a way non-related to this particular language:

Does �size� mean number of elements, bytelength of contents, memory consumed by the object?

Since Arrays in vbscript are a Function with a vice an object its no wonder I'm not getting what I expected.

Array(1,2,3,4,5,6,7)

Is the same thing as

Function(a,b,c,d,e,f,g,h)
For each of the arguments, creat and return blah
End Function

So I guess the issue is semantics more than anything. The Ubound suggestions is probably best

_____________________________

To iterate is human, to recurse divine. -- L. Peter Deutsch

(in reply to TNO)

Post #: 4

RE: Determining Array length - 11/12/2006 10:01:03 PM

ginolard

Posts: 1082
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Joined: 8/10/2005
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Yeah it's a pain. I sometimes use this function to accurately determine the length of array

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(in reply to TNO)

Post #: 5

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