title: How can I return a combined Int from an [Int] array?
body: <p>I have an <code>[Int]</code> array like so:</p>
  <pre><code>[1, 2, 3]
  </code></pre>
  <p>How can I apply a function on this so it returns:</p>
  <pre><code>123
  </code></pre>
  <p>?</p>