Syntax for ngfor

<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>

<h1 *ngFor="let item of Demo"></h1>

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