*ngFor

@Component({
  selector: 'app-root',
  template: `<h2>Welcome</h2>
  <p *ngIf="show">Show</p>
  <ul>
    <li *ngFor = "let item of items">{{item}}</li>
  </ul>
  `
})

export class Component{
  public show = true;
  public item = 'pencil';
  public items =['eraser', 'sharpener', 'pen', 'pencil', 'geometry'];
}