title: How go get *ngFor loop unique records
body: <p>How to get unique records from this array. I need to get unique <code>{{ subitem.author }}</code> from this array of items.</p>
  
  <pre><code>&lt;div *ngFor="let item of items"&gt;   
      &lt;ion-list *ngFor="let subitem of item.items" (click)="authorquotes(subitem.author);"&gt;
          &lt;ion-item &gt;
              {{ subitem.author }} 
          &lt;/ion-item&gt;
      &lt;/ion-list&gt;
  &lt;/div&gt; 
  </code></pre>
  
  <p>In array having multiple records. From that array, I need to filter unique authors.</p>