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