title: Transform an array to another array
body: <p>I'd like to transform this array to another array using lodash 2.4.2:</p>
  
  <p>authorities will be mapped in roles. and we don't touch the other properties.</p>
  
  <p>From:</p>
  
  <pre><code>      {
  
        "items": [
          {
            "_id": "admin",
            "authorities": [
              {
                "name": "ROLE_ADMIN"
              }
            ]
          },
          {
            "_id": "user",
            "authorities": [
              {
                "name": "ROLE_USER"
              }
            ]
          }
        ]
      }
  </code></pre>
  
  <p>to this array</p>
  
  <pre><code>    {
  
      "items": [
          {
            "_id": "admin",
            "roles": [
  
                "ROLE_ADMIN"
  
            ]
          },
          {
            "_id": "user",
            "role": [
  
                "ROLE_USER"
  
            ]
          }
        ]
      }
  </code></pre>
  
  <p>can you help me please?</p>