*ngFor change class of individual elements


I want to be able to create a list of items using *ngFor as follows…

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    <ion-row *ngFor="let item of items">
      <ion-col col-6 ">
        <ion-card ">
      <ion-col col-6 >
          <img [src]="item.img"/>

However, I am unsure how I could achieve this in a for loop.
Any suggestions? Thanks

UPDATE: Found answer here


Another option is to use ngFor's odd and even.