Arcgis API for Javascript 4 Calcite map add feature layer - esri

Question

I am new to the ArcGIS API for Javscript 4.0 API. Using the calcite sample on the API website. Where can I add in a feature Layer to the map view and scene view? Essentially I'm trying to merge the Feature layer sample
here: https://developers.arcgis.com/javascript/latest/sample-code/layers-featurelayer/index.html
/********************
* Add feature layer
********************/
// Carbon storage of trees in Warren Wilson College.
var featureLayer = new FeatureLayer({
url: "https://services.arcgis.com/V6ZHFr6zdgNZuVG0/arcgis/rest/services/Landscape_Trees/FeatureServer/0"
});
map.add(featureLayer);
with the calcite map sample here:
https://developers.arcgis.com/javascript/latest/sample-code/frameworks-bootstrap/index.html
but am not sure what part to add the layers to. I have tried a few times. See below. Thanks
/******************************************************************
*
* Create the map and scene view and ui components
*
******************************************************************/
// Map
var map = new Map({
basemap: app.basemap
});
app.mapView = new MapView({
container: "mapViewDiv",
map: map,
center: app.center,
scale: app.scale,
padding: app.viewPadding,
popup: new Popup({
dockOptions: app.dockOptions
}),
ui: {
components: app.uiComponents
}
});
// Scene
var mapScene = new Map({
basemap: app.basemap,
ground: "world-elevation"
});
app.sceneView = new SceneView({
container: "sceneViewDiv",
map: mapScene,
center: app.center,
scale: app.scale,
padding: app.viewPadding,
popup: new Popup({
dockOptions: app.dockOptions
}),
ui: {
components: app.uiComponents
}
});
// Set the active view to scene
app.activeView = app.mapView;
// Create the search widget and add it to the navbar instead of view
app.searchWidget = new Search({
view: app.activeView
}, "searchWidgetDiv");
app.searchWidget.startup();
// IS THIS WHERE I CAN ADD LAYERS??????????????????
var featureLayer = new FeatureLayer({
url: "https://services.arcgis.com/V6ZHFr6zdgNZuVG0/arcgis/rest/services/Landscape_Trees/FeatureServer/0"
});
app.mapView.map.add(featureLayer);
app.sceneView.map.add(featureLayer);

Answer 1

You can add them directly to the map object in 4.0. Look at the API documentation here for a small example: https://developers.arcgis.com/javascript/latest/api-reference/esri-Map.html#layers.
Essentially it would look something like this:
var featureLayer = new FeatureLayer(url);
var map = new Map({
basemap: app.basemap,
layers: [featureLayer]
});
You would need to make sure you apply this to whichever map you want them to render on.

Answer 2

you may need the following code:
var countyLayer = new FeatureLayer({
url: "http://127.0.0.1:6080/arcgis/rest/services/newyourk/MapServer/1"
});
app.map.add(countyLayer);