MarsiBarsi

@Component({})
export class AppComponent {
  readonly noneMessage = "nothing";

  readonly selectSeat$ = new Subject<number>();

  readonly selectedMessage$ = this.selectSeat$.pipe(
    scan(registerSeats, new Set<number>()),
    startWith(new Set<number>()),
    map(set => (set.size ? Array.from(set).join(", ") : this.noneMessage)),

MarsiBarsi

function expandObjWithStatus(obj, condition) {
  return {
    ...obj,
    ...(condition && {
      status: 'modified'
    })
  }
}

MarsiBarsi

const client = {name: 'John', login: 'john45', secretKey: 'xyz123'};

const {secretKey, ...clientData} = client;

clientData // {name: 'John', login: 'john45'};

MarsiBarsi

const environment = {
    type: 'prod',
    variables: {
        api: 'some-url',
        port: '8080'
    }
}

const { 
 type: envType, // we extract "type" and call it "envType" here