js object array diff

      function zxdiff(arr, arrDiff, propFn) {
        var hash = [];
        for (var x = 0; x < arrDiff.length; x++) {
          hash[propFn(arrDiff[x])] = true;
        }

        var res = [];
        for (var i = 0; i < arr.length; i++) {
          if (!hash[ propFn(arr[i]) ]) {
            res.push(arr[i]);
          }
        }
        return res;
      }