Function

let airportsResource = this.airportsService.entities();
let functionAirportsResource = airportsResource.function('Default.Function');
let functionAirportResource = airportsResource.entity('ARD').function('Default.Function');

callProperty

functionAirportsResource.callProperty().subscribe();

callEntity

functionAirportsResource.callEntity().subscribe();

callModel

functionAirportsResource.callModel().subscribe();

callEntities

functionAirportsResource.callEntities().subscribe();

callCollection

functionAirportsResource.callCollection().subscribe();