title: Is it possible to use map on methods like List.append
body: <p>I am wondering if you can use mapping like this:</p>
  
  <pre><code>x = ["a"]
  y = ["b","c","d"]
  map(x.append,y)
  </code></pre>
  
  <p>I would like x = ["a","b","c","d"], However this does not happen</p>