angular ngfor form 0 to variable code example

Example 1: how to loop a number in ngfor

//my.component.ts

counter(i: number) {
    return new Array(i);
}
//my.component.html

<li *ngFor='let in of counter(5) ;let i = index'>{{i}}</li>

Example 2: ngfor index

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