title: How to get single array from multiple array in javascript
body: <p>I have array like this  </p>
  
  <pre><code>   var arr = [
                  [ {"c": 1},{"d": 2} ],
                  [ {"c": 2},{"d": 3} ]
               ]
  </code></pre>
  
  <p>I want to change into (by javascript only)</p>
  
  <pre><code>var newArr  = [{"c": 1},{"d": 2},{"c": 2},{"d": 3}]
  </code></pre>
  
  <p>I have tried this by map but not getting expected output .</p>