// Native JS (fast)
uniq = function( /* Array */ arr) {
  var test = {};
  var result = [];
  for (var i = 0, len = arr.length; i < len; i++) {
    if (!test[arr[i]]) { // value not seen yet?
      test[arr[i]] = true;
      result.push(arr[i]);
    }
  }
  return result;
};