title: What is the difference between elemental.json and com.google.json library?
body: <p>Why do we have elemental.json library over com.google.json?</p>
  
  <p>I'm struggling with the creation of JsonArray in Vaadin 7.</p>
  
  <p>In Json.createArray() there is no add method. How can I create a json array?</p>
  
  <p>I want to create an array like:</p>
  
  <pre><code>var shapeArray = 
  [
      {type: 'rectangle', x:50, y:50, width : 50, height: 50},
      {type: 'circle', x:75, y:150,  r : 20}, 
      {type: 'rectangle', x:50, y:200, width : 100, height: 20},
      {type: 'circle', x:75, y:300,  r : 30}, 
  ];
  </code></pre>
  
  <p>Am I missing something?</p>