app.component.ts

import {Component, OnInit} from '@angular/core';
import {Router} from '@angular/router';

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.css']
})
export class AppComponent implements  OnInit {
  constructor(private router: Router) {
  }

  ngOnInit(): void {
    if (sessionStorage.getItem('username')) {
      if (sessionStorage.getItem('lecturer') === 'true') {
        this.router.navigate(['ldashboard']);
      } else {
        this.router.navigate(['sdashboard']);
      }
    } else {
      this.router.navigate(['']);
    }
  }

}