Identifying the first and the last element of a list

 

Just like the even and odd functionality, there are also two other variables that can be used to identify the first and the last elements of the list: <tr *ngFor="let hero of heroes; let first = first; let last = last"     [ngClass]="{ first: first, last: last }">     <td>{{hero.name}}</td> </tr> <table>     <thead>         <th>Name</th>     </thead>     <tbody>       <tr class='first'>            <td>Superman</td>        </tr>        ...       <tr class='last'>            <td>Flash</td>        </tr>        </tbody> </table>