title: How to obtain the absolute value of numbers?
body: <p>I have a list of numbers that looks like the one below:</p>
  <pre><code>[2, 3, -3, -2]
  </code></pre>
  <p>How can I obtain a list of values that contain the absolute value of every value in the above list? In this case it would be:</p>
  <pre><code>[2, 3, 3, 2]
  </code></pre>