get non duplicate array using javascript

here is my solution

function eliminateDuplicates(arr) {
        var i,
        len = arr.length,
        out = [],
        obj = {};

        for (i = 0; i < len; i++) {
            if (obj[arr[i]] != 0 && arr[i] != undefined)
                obj[arr[i]] = 0;
            else
                delete obj[arr[i]];
        }
        for (i in obj) {
            out.push(i);
        }
        return out;
    }