import { Injectable } from '@angular/core';
import { BehaviorSubject } from 'rxjs/BehaviorSubject';
import { distinctUntilChanged } from 'rxjs/operators/distinctUntilChanged';

@Injectable()
export class CourseDataService {

  private classIdSubject = new BehaviorSubject<string>(null);
  public classId = this.classIdSubject.asObservable().pipe(distinctUntilChanged());


  constructor() { }

  setClassId(classId: string) {
    this.classIdSubject.next(classId);
  }

  getClassId(): string {
    return this.classIdSubject.value;
  }
}