Difference betwen these two ways of creating objects of arrays
<pre><code>var obj = {};
obj.arr1 = [];
obj.arr2 = [];
</code></pre>

<p>// Does the above one create a new object each time. </p>

<pre><code>var obj = {
  obj.arr1 = [],
  obj.arr2 = []
};
</code></pre>
