how to declare/assign an builtin multi-dimensional array in one statement?

such as,

var abc:int[,] = [[1,2,3]];

I have tried substituting the [ with { and ( in all combinations, but it seems none of them workd.

Hi. A quick googlin’ provided this link in regards to JavaScript:
JavaScript: Multi-dimensional array

I use C# with Unity so I’m unsure if this technique is the best when working with Unity’s flavor of JS.

If you’d prefer C#, it’s pretty straightforward, from the MSDN Example:

int[,,] myArray = new int [4,2,3];

EDIT: Here is some info from the Unify Wiki on multidimensional arrays in JS.