ngfor with index

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

1/*
2ngFor with index in angular is used here for generating 'li' element till the studentDetails array length.
3And also make a note if you are using angular 1 then you have to replace 'let' with '#', but its ok if you are using angular 2 or above.
4*/
5
6<ul>
7    <li *ngFor="let student of studentDetails; index as i;" [attr.data-index]="i">
8        {{student}}
9    </li>
10</ul>
11
12/*
13I hope it will help you.
14Namaste
15*/

1*ngFor="let item of items; index as i;" 
2// OR
3*ngFor="let item of items; let i = index;"
4// i will be the index, starting from 0 
5// and you can show it in the string interpolation with {{ i }}

1<ul>
2    <li *ngFor="let item of items; index as i">
3        {{item}}
4    </li>
5</ul>

1
2      <li *ngFor="let item of items; index as i; trackBy: trackByFn">...</li>
3    

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