underscore.js - Finding nested duplicate arrays in JavaScript. (Nested Array uniq in lodash/underscore)

Question

I am trying to determine if an array of JavaScript arrays contains duplicates. Is this possible? I am first trying to see if I can strip the duplicates out and then do an equality check but I cannot get past the first part. Here is what underscore returns:

var arr1 = [[1,2], [2,3], [1,2]];
var arr2 = _.uniq(arr1);

var arraysAreEqual = _.isEqual(arr1, arr2);

console.log(arraysAreEqual, arr1, arr2);
// true

Jsbin: http://jsbin.com/vogumo/1/edit?js,console

Anyone know of a way to determine if the array contains duplicate arrays?

Answer 1

It's a little sloppy, but (possible)

var arr2 = _.uniq(arr1, function(item) {
    return JSON.stringify(item);
});

will give you a correct result