title: How to flatten an array of arrays - but not all the way down
body: <p>What's the best way to convert this</p>
  
  <pre><code>[[["Club three Team one", 7800], ["Club three Team two", 7801]], [], [["Club four Team one", 7807], ["Club four Team two", 7808]], []]
  </code></pre>
  
  <p>into </p>
  
  <pre><code>[["Club three Team one", 7800], ["Club three Team two", 7801], ["Club four Team one", 7807], ["Club four Team two", 7808]]
  </code></pre>
  
  <p>in ruby? flatten converts this all the way down to </p>
  
  <pre><code>["Club three Team one", 7303, "Club three Team two", 7304, "Club four Team one", 7310, "Club four Team two", 7311]
  </code></pre>