UBound

Return the largest subscript for an array dimension.

Syntax 
      UBound(arrayname[, dimension])


Key
   arrayname    The name of the array variable

   dimension    The array dimension as a whole number
                1 for the first dimension, 2 for the second etc
                (default=1)

Example

Dim Arr(5,10,12)
result = UBound(Arr, 1)
WScript.Echo result

“Who looks outside, dreams; who looks inside, awakes” - Carl Gustav Jung

Related:

Array(el1,el2,el3) - Add values to an Array variable
Dim - Declare a new variable or array variable
Equivalent Powershell command: $arrDemo.getupperbound(0) or $arrDemo.length-1