Check out example codes for "represent array items angular". It will help you in understanding the concepts better.

Code Example 1

//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

Code Example 2

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

Learn ReactJs, React Native from akashmittal.com