Symbol.iterator in Internet Explorer doesn't work

try to search the string:

` for (var _iterator = files[Symbol.iterator](), _step; !(_iteratorNormalCompletion = (_step = _iterator.next()).done); _iteratorNormalCompletion = true)`

I'm talking about this loop

But I solved this issue replacing with this code:

`    try {
      for(var i = 0; i < files.length; i++){
        var file = files[i];
        _loop(file);
      }
    } catch (err) {
      _didIteratorError = true;
      _iteratorError = err;
    } finally {
      if (_didIteratorError) {
        throw _iteratorError;
      }
    }`


I don't know if it is a good solution, but in Internet Explorer works fine