title: Troubling removing string in Javascript array
body: <p>I am having trouble understanding what to do next. The following code removes all the duplicate numbers but I also need to remove the strings without converting them to numbers. I'm not sure how to proceed...</p>
  
  <pre><code>var arr = [ 10, 44, 55 ,66 , 77 , 55 , 44 , 3 , 3 , 3 , 4 , 5 , 6 , 54 , "henry", "33", "£", "66"]
  var max = {};
  function biggerThanMax(arr){
      return arr.filter(function(item,index){
          return arr.indexOf(item) &gt;= index;
      });
  };
  biggerThanMax(arr)
  </code></pre>