ngfor

1<ul>
2    <li *ngFor="let item of items; let i = index" [attr.data-index]="i">
3        {{item}}
4    </li>
5</ul>

1
2      <li *ngFor="let item of items; index as i; trackBy: trackByFn">...</li>
3    

1                <td *ngFor="let col of options.cols;index as i">
2                        {{item[i]}} //Angular solution
3                </td>

1//for 
2<div *ngFor='let [data] of [dataArray]; let i=index;'>
3  <h2> {{i}} {{data.title}} </h2>
4  <img src='{{data.image}}' />
5  </div>   
6  //the data contained in an array will be displayed element by element
7  //similar to the function .map() in React
8