array bounds

I know this is a silly question, but, how can I get the upper bound of a unidimensional array?

Local ThisArray:Int[1,2,3]
Local ArrayDim:Int[]

ArrayDim = ThisArray.Dimensions()
Print ArrayDim[0]+" "+ArrayDim[1]+" "+ArrayDim[2]

.Dimensions()[0]

As it returns an array with all dimensions if you have a multidimensional array.

Thanks!