‹div *ngFor="let hero of heroes; let i=index; let odd=odd; trackBy: trackById" [class.odd]="odd"›
  ({{i}}) {{hero.name}}
‹/div›

‹ng-template ngFor let-hero [ngForOf]="heroes" let-i="index" let-odd="odd" [ngForTrackBy]="trackById"›
  ‹div [class.odd]="odd"›({{i}}) {{hero.name}}‹/div›
‹/ng-template›