code: function getTotalFlexGrow(columns) {
      var totalFlexGrow = 0;
      for (var _i = 0, columns_1 = columns; _i < columns_1.length; _i++) {
          var c = columns_1[_i];
          totalFlexGrow += c.flexGrow || 0;
      }
      return totalFlexGrow;
  }
docs: Calculates the Total Flex Grow