Get unique array

gistfile1.js

// FROM http://jsperf.com/compare-array-unique-versions/4
Array.prototype.getUnique = function () {
        var arr = this;
        var newArr = [],
        i = 0,
        j = 0,
        obj = {},
        len = arr.length;
        while (len--) {
                if (!obj[arr[i]]) {
                        obj[arr[i]] = 1;
                        newArr[j] = arr[i];
                        j++;
                }
                i++;
        }
        return newArr;
    };