HTML

ngfor

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

ngfor

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

ngFor

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