When using Angular 2, 4, or 5, you cannot directly use $index. To utilize the index, you need to define it first.
<li *ngFor="let item of items; let i = index">{{item}} - {{i}}</li>
{{i}} represents the index of items
However, in Angular 1.x, you can use the index like this:
<li ng-repeat="let item of items>{{item}} - {{$index}}</li>
When working with Angular 2+, it is important to note the changes in syntax for obtaining the index. In Angular 2 and later versions, the ng-repeat directive has been replaced with *ngFor.
<li *ngFor="let user of userObservable | async as users;
index as i; ">
{{i}}/{{users.length}}. {{user}}
</li>
Alternatively, you can use:
<li *ngFor="let user of userObservable | async as users;
let i = index; ">
{{i}}/{{users.length}}. {{user}}
</li>
For more information, you can refer to the documentation on NgForOf.
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