export class TableColToggleDemo implements OnInit {

    cars: Car[];

    cols: any[];

    selectedColumns: any[];

    constructor(private carService: CarService) { }

    ngOnInit() {
        this.carService.getCarsSmall().then(cars => this.cars = cars);

        this.cols = [
            { field: 'vin', header: 'Vin' },
            { field: 'year', header: 'Year' },
            { field: 'brand', header: 'Brand' },
            { field: 'color', header: 'Color' }
        ];

        this.selectedColumns = this.cols;
    }
}

<p-table [columns]="selectedColumns" [value]="cars">
    <ng-template pTemplate="caption">
        <div style="text-align:left">
            <p-multiSelect [options]="cols" [(ngModel)]="selectedColumns" optionLabel="header"
                        selectedItemsLabel="{0} columns selected" [style]="{minWidth: '200px'}" defaultLabel="Choose Columns"></p-multiSelect>
        </div>
    </ng-template>
    <ng-template pTemplate="header" let-columns>
        <tr>
            <th *ngFor="let col of columns">
                {{col.header}}
            </th>
        </tr>
    </ng-template>
    <ng-template pTemplate="body" let-rowData let-columns="columns">
        <tr>
            <td *ngFor="let col of columns">
                {{rowData[col.field]}}
            </td>
        </tr>
    </ng-template>
</p-table>