We would like to know how to test if array is multidimensional.
<!DOCTYPE html>
<html>
<head>
<script type='text/javascript'>
<!-- w ww.j ava 2 s . c o m-->
var ratings = [[1], [2], 'test'];
document.writeln( ratings.filter(Array.isArray).length );
</script>
</head>
<body>
</body>
</html>
The code above is rendered as follows: