import { Injectable } from '@angular/core'; import { of as observableOf, Observable } from 'rxjs'; import { TemperatureHumidityData, Temperature } from '../data/temperature-humidity'; @Injectable() export class TemperatureHumidityService extends TemperatureHumidityData { private temperatureDate: Temperature = { value: 24, min: 12, max: 30, }; private humidityDate: Temperature = { value: 87, min: 0, max: 100, }; getTemperatureData(): Observable { return observableOf(this.temperatureDate); } getHumidityData(): Observable { return observableOf(this.humidityDate); } }