test if array is multidimensional

Question

How would I test to see if a variable includes an multidimensional array? For example:

var obj = [1, 2];

vs

var obj = [[1], [2]];

I have used Array.isArray(obj) to test whether is an array, but I can't figure out how to test the number of arrays.

Answer 1

Assuming you meant

var ratings = [[1], [2]];

as var ratings = [1], [2]; is a syntax error, you could do

ratings.filter(Array.isArray).length

to get the number of arrays inside the wrapping array (2)

FIDDLE