title: Double square brackets in Vue.js data
body: <p>I am doing some charting tutorials that leverage Vue.js. Excellent charts and I am a big fan of Vue.js, but recently came across double square brackets. I have no idea how to generate this with JSON data? For instance I can build an array that looks like this: </p>
  
  <pre><code>[{book:"2"},{phone:"3"},{television:"10"}]
  </code></pre>
  
  <p>How would I generate an array that looks like this one: </p>
  
  <pre><code>[["book",2],["Phone",2],["television",22]] 
  </code></pre>
  
  <p>with double brackets from an AJAX response?</p>