title: Check is even ngFor angular 4
body: <p>I have the bellow code to display two images in a single row.but the checking <code>*ngIf="even"</code> was not working .What is wrong with this?</p>
  
  <pre><code> &lt;div *ngFor="let narative_image of narative_images;let i = index;"&gt;
         &lt;ion-row *ngIf="even" &gt;
             &lt;ion-col&gt;
               &lt;img  style="width: 100%; height: auto;"   src="{{narative_image[i].thumbimg}}" /&gt;
             &lt;/ion-col&gt;
             &lt;ion-col&gt;
                &lt;img  style="width: 100%; height: auto"  src="{{narative_image[i+1].thumbimg}}" /&gt;
             &lt;/ion-col&gt;
         &lt;/ion-row&gt;
     &lt;/div&gt;
  </code></pre>