API Reference > geometry-core > CartesianGeometry > Point2dArrayCarrier > getVector2dAtCheckedVectorIndex getVector2dAtCheckedVectorIndex Method Access by index, returning strongly typed Vector2d getVector2dAtCheckedVectorIndex(index: number, result?: Vector2d): Vector2d | undefined Parameter Type Description index number index of point within the array result Vector2d caller-allocated destination Returns - Vector2d | undefined undefined if the index is out of bounds Defined in core/geometry/src/geometry3d/Point2dArrayCarrier.ts Line 52 Last Updated: 15 June, 2021