angular ngFor is an index a index value a number or a string code example
Example 1: ngfor index
<ul>
<li *ngFor="let item of items; let i = index" [attr.data-index]="i">
{{item}}
</li>
</ul>
Example 2: how to get index for ngfor
*ngFor="let item of items; index as i;"
// OR
*ngFor="let item of items; let i = index;"
// i will be the index, starting from 0
// and you can show it in the string interpolation with {{ i }}