title: Find the length of an inner array in actionscript3
body: <p>I have an array</p>
  
  <pre><code>var arr:Array = new Array( {num1:1, num2:2}, {num1:1, num2:2} );
  </code></pre>
  
  <p>And i want to get the length of  the first inner array like this: </p>
  
  <pre><code>trace(arr[0].length); //should return 2 but it doesnt work
  </code></pre>
  
  <p>Also why <strong>arr[0][0]</strong> doesnt work?
  i have to specify <strong>arr[0]['name']</strong></p>