title: Internet Explorer 11 - Object doesn't support property or method 'includes'
body: <p>I'm getting this error in IE 11, on all other common browsers it works fine.</p>
  
  <p>I use this code which makes use of 'includes':</p>
  
  <pre><code>const keys = Object.keys(this.service.content);
  
              if (keys.includes(splitUrl[splitUrl.length - 1])) {
                  this.router.navigateByUrl(`/mysite/${splitUrl[splitUrl.length - 1]}/1`);
              }
  </code></pre>
  
  <p>Any alternatives?</p>