title: How can I add an array within multiple arrays?
body: <p>I created a large array that is similar to this:</p>
  
  <pre><code>data = [ [1,2,3], [0,1,3],[1,5,3]]
  </code></pre>
  
  <p>How can I make it so my new array sums up each individual array as shown?</p>
  
  <pre><code>data = [ [6],[4],[9] ]
  </code></pre>