ngfor loop in angular code example

Example 1: angular ngfor index

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

Example 2: 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 3: ngFor

//for 
<div *ngFor='let [data] of [dataArray]; let i=index;'>
  <h2> {{i}} {{data.title}} </h2>
  <img src='{{data.image}}' />
  </div>   
  //the data contained in an array will be displayed element by element
  //similar to the function .map() in React

Example 4: ngfor

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