polygerrit-ui/app/behaviors/gr-change-table-behavior/gr-change-table-behavior.html

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<script>
(function(window) {
  'use strict';

  /** @polymerBehavior Gerrit.ChangeTableBehavior */
  var ChangeTableBehavior = {
    properties: {
      columnNames: {
        type: Array,
        value: [
          'Subject',
          'Status',
          'Owner',
          'Project',
          'Branch',
          'Updated',
          'Size',
        ],
        readOnly: true,
      }
    },

    /**
     * Returns the complement to the given column array
     * @param {Array} columns
     */
    getComplementColumns: function(columns) {
      return this.columnNames.filter(function(column) {
        return columns.indexOf(column) === -1;
      });
    },

    isColumnHidden: function(columnToCheck, columnsToDisplay) {
      return columnsToDisplay.indexOf(columnToCheck) === -1;
    },
  };

  window.Gerrit = window.Gerrit || {};
  window.Gerrit.ChangeTableBehavior = ChangeTableBehavior;
})(window);
</script>