title: Use index array to filter another array
body: <p>I have two arrays </p>
  
  <pre><code>arr = [ aaa, xxx, aaa, xxx, aaa ];
  
  foundIn = [ 1, 3 ];
  </code></pre>
  
  <p>As you can see <strong>foundIn</strong> has the index numbers of <strong>arr</strong> that I would like to remove. How can I remove the values in <strong>arr</strong> using the the index values in <strong>foundIn</strong></p>
  
  <pre><code>The output being: newArr = [ aaa, aaa, aaa ];
  </code></pre>
  
  <p>This is a simplified version of my issue.</p>
  
  <p>Any help in this would be greatly appreciated.</p>