default parameters in node.js : <p>How does one go about setting default parameters in node.js?</p>

<p>For instance, let's say I have a function that would normally look like this:</p>

<pre><code>function(anInt, aString, cb, aBool=true){
   if(bool){...;}else{...;}
   cb();
}
</code></pre>

<p>To call it would look something like this:</p>

<pre><code>function(1, 'no', function(){
  ...
}, false);
</code></pre>

<p>or:</p>

<pre><code>function(2, 'yes', function(){
  ...
});
</code></pre>

<p>However, it doesn't seem that node.js supports default parameters in this manner.  What is the best way to acomplish above?</p>
