If you have a multi-dimensional array, you can use the same logic as the prior waypoint to loop through both the array and any sub-arrays. Here is an example:

var arr = [

[1,2], [3,4], [5,6]

];

for (var i=0; i < arr.length; i++) {

for (var j=0; j < arr[i].length; j++) {

console.log(arr[i][j]);

}

}

This outputs each sub-element in `arr`

one at a time. Note that for the inner loop, we are checking the `.length`

of `arr[i]`

, since `arr[i]`

is itself an array.

Modify function `multiplyAll`

so that it multiplies the `product`

variable by each number in the sub-arrays of `arr`