title: Given list of booleans, compare and create a new list
body: <p>let's say I have two lists, with one being all boolean:</p>
  
  <pre><code>[True, False, True]
  [1, 2, 3]
  </code></pre>
  
  <p>Is there a function to compare these lists index-by-index, and create a new list of "true" values? </p>
  
  <pre><code>[1, 3]
  </code></pre>