title: applying additional ngclass expression on table header
body: <p>I am trying to set the background colour of a column based on ngclass expression. I already have an existing expression. How do I add additional expression. If you see my code below I am looping through column names and applying ngclass expression</p>
  
  <pre><code>&lt;table id="LegalFundClass" class="fundClassesTable table-striped"&gt;
                      &lt;tr *ngFor="let c of LegalFundClasses.LegalFundClassColumnNames"&gt;
                          &lt;ng-container
                              *ngIf="c !='Hurdle Rate Basis' &amp;&amp; c != 'Hurdle Rate %' &amp;&amp; c != 'Hurdle Rate Index' || isHurdle;"&gt;
                              &lt;ng-container *ngIf="c !='Clawback %' || isClawback"&gt;
  
                                  &lt;th
                                      [ngClass]="c != 'Space1' &amp;&amp; c != 'Space2' &amp;&amp; c != 'Space3' &amp;&amp; c != 'Buttons' ? 'tableItem bold' : 'tableItem cellbgcolor'"&gt;
                                      {{ c }}&lt;/th&gt;
  </code></pre>
  
  <p>I need also add the following expression. How do I do that</p>
  
  <pre><code>c== 'TERMS' apply class mainheading
  </code></pre>