const farArcade = `
  var buildingFootprints = Intersects($feature, FeatureSetByName($map, "Building Footprints"));

  var grossFloorArea = 0;
  for (var building in buildingFootprints){
    var floors = IIF(building.FLOORCOUNT == 0, 1, building.FLOORCOUNT);
    grossFloorArea += ( AreaGeodetic( Intersection(building, $feature), 'square-feet') * floors );
  }

  Round( ( grossFloorArea / AreaGeodetic($feature, 'square-feet') ), 1);
`;

// Loads the necessary resources for the expression including the
// geometry engine and permits async execution of the script
popupProfile.initialize( [ farArcade ] ).then(function(){
  // loads layers from a webmap with the given id
  arcgisUtils.createMap("da634028a734418f8a5416c675559c3a", "map")
    .then(function (response) {
      const map = response.map;
      const layerIds = map.graphicsLayerIds;
      const layer = map.getLayer(layerIds[1]);

      // Reference the expression in the popup template and set it on the parcels layer
      layer.setInfoTemplate( new PopupTemplate({
        description: "Floor Area Ratio (FAR): {expression/far}",
        expressionInfos: [{
          name: "far",
          title: "far",
          expression: farArcade
        }]
      }) );
    });
});