title: How to sum an array of strings, representing ints
body: <p>How to sum such an Array
  <code>
  [ '',
    '4490449',
    '2478',
    '1280990',
    '22296892',
    '244676',
    '1249',
    '13089',
    '0',
    '0',
    '0\n' ]
  </code></p>
  
  <p>If I call something like that <code>['','4490449', ... , '0\n' ].reduce(function(t,s){ return t+s)</code> on that array, the stings are joined and not summed.</p>
  
  <p>I've tried some casting with <code>parseInt()</code> but this results in <code>NaN</code> :)</p>