NgFor

Ngfor index

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

Source: stackoverflow.com

Ngfor

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

Source: angular.io

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

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