Esri ArcGIS Maps SDK for JavaScript Associate (EJSA_2024) Certification Sample Questions

01. Voting precincts each store separate count fields for several parties. The map should color each precinct by which party field holds the largest value, so readers instantly see the winning category per precinct.
Which approach produces this predominance visualization?
a) A ClassBreaksRenderer on the single largest party's field
b) A DotDensityRenderer across all the party fields
c) A UniqueValueRenderer on an Arcade max-value expression

02. Marketing wants polygons showing everywhere reachable within 5, 10, and 15 minutes' drive of each store, following the actual road network.
Which class produces these drive-time areas?
a) geometryEngine.buffer()
b) ServiceAreaTask
c) ClosestFacilityTask

03. Before rendering a dashboard you must load three independent FeatureLayers. They have no dependency on each other, and you want them to load concurrently and continue only after all three have finished.
Which pattern is the most efficient fit?
a) Await each layer.load() one after another in sequence
b) Call Promise.race() on the three load() Promises
c) Pass the three load() Promises to Promise.all() and await the result

04. When a user clicks the map you need the clicked screen point and map coordinates from that interaction.
Which approach fits, and why?
a) view.on("click", (event) => { /* mapPoint, screenPoint */ }) — clicks are events.
b) reactiveUtils.watch(() => view.clicked, handler) — watch for the click state to change.
c) reactiveUtils.on(() => view, "stationary", handler) — subscribe through the reactive API.

05. Every feature in a layer must remain drawn, but each feature's transparency should encode a numeric confidence value — low-confidence features more transparent, high-confidence features opaque.
Which approach produces this data-driven, per-feature transparency?
a) Set FeatureLayer.opacity to a fractional value such as 0.5 for the layer.
b) Add an opacity visual variable driven by the confidence field.
c) Lower the view's overall transparency.

06. After a user applies an attribute filter, you want to reframe the map to the full bounding box of every matching feature, ideally without downloading each feature's geometry to the client.
Which FeatureLayer query method fits this need?
a) queryExtent(query)
b) queryFeatureCount(query)
c) queryObjectIds(query)

07. In a SceneView you symbolize wind turbines with an IconSymbol3DLayer and set size to 30, expecting 30-meter-tall turbines. Instead they stay a constant on-screen size as the camera moves.
Why, and what fixes it so the turbines render at their true real-world height?
a) Keep IconSymbol3DLayer but set a size visual variable in meters
b) Switch the basemap to a projected coordinate system so points become meters
c) Use an ObjectSymbol3DLayer, whose size is expressed in real-world meters

08. You want a polygon layer of counties to shade along a continuous ramp from light to dark based on a numeric median_income field, without pre-defining discrete class breaks.
Which visual variable configuration accomplishes this?
a) A size visual variable with field: "median_income"
b) A color visual variable on median_income with color stops
c) A UniqueValueRenderer keyed on the continuous median_income values

09. On small screens a developer wants the feature popup to always open as a docked panel rather than floating over the map.
Which configuration achieves this?
a) Set view.constraints to a fixed extent to force docking on small screens.
b) Set the layer's popupEnabled to false.
c) Configure dockOptions on view.popup with dockEnabled: true.

10. Drone flight paths are loaded as a line FeatureLayer in a SceneView. Each vertex carries a true GPS altitude (z), and the paths must float at that real altitude above the terrain rather than being laid onto the ground surface.
Which elevationInfo mode should the layer use?
a) "absolute-height"
b) "relative-to-ground"
c) "on-the-ground"