title: Concat doesn't seem to work on a JSON obtained array
body: <p>I'm having a some trouble with the concat function in javascript.  As far as I can tell, I'm using it correctly, but it's not successfully concatenating the array "value" from the JSON onto the array "currentAbilities":  </p>
  
  <pre><code>$.each(ABILITIES, function(key,value) {
          if(key==raceName||(key==className&amp;&amp;(!isAcolyte)))
          {
              document.getElementById('abs').innerHTML = value[1];
              currentAbilities.concat(value);
          }
      })
  </code></pre>
  
  <p>The innerHTML setting line shows that the array "value" does exist.  Any idea why I'm failing to concat?  Value of course comes from a JSON, could that have anything to do with it?  I'm afraid I only recently became familiar with $.each and JSON usage and may be doing it wrong.</p>