Edit features with the Editor widget

Realistic water visualization in 3D

Edit features in 3D with the Editor widget

Dot density

Point clustering - advanced configuration

SceneLayerView - query statistics by geometry

Filter BuildingSceneLayer with BuildingExplorer

Multiple layer blending

Line of sight widget

ImageryTileLayer - shaded relief renderer

Animate opacity visual variable

CSVLayer - Project points on the fly

You can also download the ArcGIS API for JavaScript 4.16 single archive with all samples.