code: function(format) {
      if (typeof format === "undefined") {
        _deleteOwnProperties(_clipData);
        _clipDataFormatMap = null;
      } else if (typeof format === "string" && _hasOwn.call(_clipData, format)) {
        delete _clipData[format];
      }
    }
docs: The underlying implementation of `ZeroClipboard.clearData`.
  @private