title: Underscore.js - get unique property values
body: <p>I only recently discovered the power of underscore.js, still new to the methods I kindly ask for a suggestion:</p>
  
  <p>How do I get from this: </p>
  
  <pre><code>[
      [{
          "name": "Type 2",
          "id": 14
      }],
      [{
          "name": "Type 1",
          "id": 13
      }, {
          "name": "Type 3",
          "id": 15
      }],
      [{
          "name": "Type 2",
          "id": 14
      }],
      [{
          "name": "Type 1",
          "id": 13
      }]
  ]
  </code></pre>
  
  <p>to this: </p>
  
  <pre><code>["Type 1","Type 2","Type 3"]
  </code></pre>
  
  <p>i.e. no duplicated and "name" property only.</p>
  
  <p>Any suggestions much appreciated.</p>