Observable map key example

map-example-in-angular7.ts

import { Observable, BehaviorSubject, ReplaySubject, pipe } from 'rxjs';
import { of as observableOf } from 'rxjs';
import { tap, map } from 'rxjs/operators';
import { distinctUntilChanged } from 'rxjs/operators';

  return this.http.post(`${environment.host}${environment.loginService}`, credentials)
      .pipe(
      map(response => {
        const storage = sessionStorage;
    
        return response['userDetails'];
      }));