title: *ngFor - Loop two arrays in the same level
body: <p>I'm trying to loop two arrays by using one *ngFor but it doesn't show any element on the browser. I have sample of HTML file below also initialized arrays in component file. </p>
  
  <p>HTML file:</p>
  
  
  
  <pre class="lang-html prettyprint-override"><code>&lt;tbody *ngIf="feedbacks.length"&gt;
            &lt;ng-container *ngFor="let fd of feedbacks;let res of results;let i=index"&gt;
              &lt;tr&gt;
                &lt;td&gt;{{ i }}&lt;/td&gt;
                &lt;td&gt;{{fd}}&lt;/td&gt;
                &lt;td colspan="2"&gt;
                  &lt;ul&gt;
                    &lt;div *ngFor="let obj of res"&gt;
                      &lt;td&gt;Score: {{res.score}}&lt;/td&gt;
                      &lt;td&gt;Emotion: {{res.tone_name}}&lt;/td&gt;
                    &lt;/div&gt;
                  &lt;/ul&gt;
                &lt;/td&gt;
              &lt;/tr&gt;
            &lt;/ng-container&gt;
          &lt;/tbody&gt;
  </code></pre>
  
  <p>Typescript file : </p>
  
  <pre class="lang-js prettyprint-override"><code>  results = [];
    feedbacks = [];
  
    ngOnInit(){
  
      this.feedbacks = ["Le système est trop lent ", "Le top! Un exemple d'excellence.", "C'est quoi ce bordel !"]; 
  
      this.results = [
        [{score: 0.535632, tone_id: "anger", tone_name: "Colère"}],
        [{score: 0.633569, tone_id: "anger", tone_name: "Colère"},
         {score: 0.506763, tone_id: "analytical", tone_name: "Analytique"}],
        [{score: 0.895438, tone_id: "joy", tone_name: "Joie"}]  
      ];
      console.log(this.results);
  
    }
  </code></pre>