title: Merge 2 arrays of objects in only 1 with a list
body: <p>Lets have a look an example:</p>
  
  <pre><code>var arr1 = new Array({name: "lang", value: "German", carId: 1}. {name: "lang", value: "German", carId: 3});
  </code></pre>
  
  <p>I need to merge this two arrays and convert that carId into a list with those values:</p>
  
  <pre><code>({name: "lang", value: "German", carId: [1,3]});
  </code></pre>