title: Filtering items by value inside ngFor without writing Pipes
body: <p>I have the following Component:</p>
  
  <pre><code>class MyComponent {
    public mode = 'v';
    readonly modes = ['v', 'a', 'd'];
    ....
  }
  </code></pre>
  
  <p>Now I want to use an <code>ngFor</code> to display buttons for all modes in <code>modes</code> except the current mode stored in <code>mode</code>. I have the following code:</p>
  
  <pre><code>&lt;button *ngFor="let othermode of modes"&gt;
    {{ othermode }}
  &lt;/button&gt;
  </code></pre>
  
  <p>I always want two buttons to be displayed, containing the remaining 2 modes. I tried this:</p>
  
  <pre><code>&lt;button *ngFor="let othermode of modes.filter(elem =&gt; elem !== this.mode)"&gt;
    {{ othermode }}
  &lt;/button&gt;
  </code></pre>
  
  <p>but it isn't working. All questions I saw required to write a custom pipe for this feature, but isn't there any simple way to filter an array of strings, using just the values ?</p>