function flipud3d( x ) {
	var out;
	var i;

	out = [];
	for ( i = 0; i < x.length; i++ ) {
		out.push( flipud2d( x[ i ] ) );
	}
	return out;
}
Reverses the order of elements along the second-to-last dimension of a three-dimensional nested input array.

## Notes

-   The function does **not** perform a deep copy of nested array elements.

@param {ArrayLikeObject<ArrayLikeObject<Collection>>} x - nested input array
@returns {Array<Array<Collection>>} output array

@example
var x = [ [ [ 1, 2 ], [ 3, 4 ], [ 5, 6 ] ] ];

var out = flipud3d( x );
// returns [ [ [ 5, 6 ], [ 3, 4 ], [ 1, 2 ] ] ]